A critical evaluation of the analytical method used for the separation and estimation of copper and nickel
- Authors: Sismey, J E
- Date: 1948
- Subjects: Copper -- Analysis , Nickel -- Analysis
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4519 , http://hdl.handle.net/10962/d1014335
- Description: [From Introduction]. This thesis deals with the determination of copper and nickel both separately and in each other's presence. The work is divided into two sections, one of which treats the subject from the theoretical side while the other contains an account of the practical work performed by the author. In the theoretical section, an attempt is made to summarise the better-known methods for the determination of copper and nickel, and at the same time, to incorporate such improvements, criticism and variations as have appeared in the literature. The subject is so vast that its summary in so short a space must necessarily be incomplete. Yoe and Server, for example, quote 111 references on the subject of the nickel-dimethylglyoxine with other ions. Only a fraction of the literature was available, and space permitted only a fraction of this to be abstracted in the following pages.
- Full Text:
- Authors: Sismey, J E
- Date: 1948
- Subjects: Copper -- Analysis , Nickel -- Analysis
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4519 , http://hdl.handle.net/10962/d1014335
- Description: [From Introduction]. This thesis deals with the determination of copper and nickel both separately and in each other's presence. The work is divided into two sections, one of which treats the subject from the theoretical side while the other contains an account of the practical work performed by the author. In the theoretical section, an attempt is made to summarise the better-known methods for the determination of copper and nickel, and at the same time, to incorporate such improvements, criticism and variations as have appeared in the literature. The subject is so vast that its summary in so short a space must necessarily be incomplete. Yoe and Server, for example, quote 111 references on the subject of the nickel-dimethylglyoxine with other ions. Only a fraction of the literature was available, and space permitted only a fraction of this to be abstracted in the following pages.
- Full Text:
A study of conditions in the upper atmosphere and their deduction from radio measurements
- Gledhill, J A, Szendrei, M E
- Authors: Gledhill, J A , Szendrei, M E
- Date: 1948
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:21181 , http://hdl.handle.net/10962/6795
- Description: Summary: In part 1 (a), after a brief historical outline of methods of ionospheric investigation and their development, the construction in this laboratory of manually operated equipment for sounding the ionosphere is described. Photographic records of good definition were taken at regular intervals over a period of four months during the summer of 1945-6. These were fully sealed for critical frequencies, true heights and thicknesses of all the layers present, and mean monthly values of these quantities for each hour are tabulated. An extensive correlation with magnetic data from Hermanus indicated good correlation between magnetic activity and disturbed ionospheric conditions. On these grounds some disturbed days were rejected, and others were eliminated on ionospheric grounds. Smoothed mean values are tabulated and graphs drawn. These are presented in concise form on "electron density maps", which are graphs showing lines of constant electron density plotted as functions of time and height. In part 1 (b), a new theory of layer-formation is developed, in which the temperature is assumed to vary linearly with height. The equations are compared at each step with those obtained by Chapman in his theory of layer-formation in an isothermal atmosphere. The equations for the maximum of electron density and its height are also given. The effect of the parameters on the shape of the layer is shown in graphical form. The equations are somewhat complex in form, but an ingenious graphical method has been devised suitable for the application of the theory to results given in the form of those in section 1 (a). From this application values are obtained for the temperature gradient, the temperature at 200 km. and its variation over the middle part of the day. The results obtained are in accordance with previous estimates, and offer numerical confirmation of the theory that the atmosphere expands bodily upwards during the middle part of a summer day.
- Full Text:
- Authors: Gledhill, J A , Szendrei, M E
- Date: 1948
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:21181 , http://hdl.handle.net/10962/6795
- Description: Summary: In part 1 (a), after a brief historical outline of methods of ionospheric investigation and their development, the construction in this laboratory of manually operated equipment for sounding the ionosphere is described. Photographic records of good definition were taken at regular intervals over a period of four months during the summer of 1945-6. These were fully sealed for critical frequencies, true heights and thicknesses of all the layers present, and mean monthly values of these quantities for each hour are tabulated. An extensive correlation with magnetic data from Hermanus indicated good correlation between magnetic activity and disturbed ionospheric conditions. On these grounds some disturbed days were rejected, and others were eliminated on ionospheric grounds. Smoothed mean values are tabulated and graphs drawn. These are presented in concise form on "electron density maps", which are graphs showing lines of constant electron density plotted as functions of time and height. In part 1 (b), a new theory of layer-formation is developed, in which the temperature is assumed to vary linearly with height. The equations are compared at each step with those obtained by Chapman in his theory of layer-formation in an isothermal atmosphere. The equations for the maximum of electron density and its height are also given. The effect of the parameters on the shape of the layer is shown in graphical form. The equations are somewhat complex in form, but an ingenious graphical method has been devised suitable for the application of the theory to results given in the form of those in section 1 (a). From this application values are obtained for the temperature gradient, the temperature at 200 km. and its variation over the middle part of the day. The results obtained are in accordance with previous estimates, and offer numerical confirmation of the theory that the atmosphere expands bodily upwards during the middle part of a summer day.
- Full Text:
The economics of state assistance to agriculture with special reference to future policy in South Africa
- Authors: Threlfell, R L
- Date: 1948
- Subjects: Agriculture and state -- South Africa
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:1107 , http://hdl.handle.net/10962/d1013399
- Description: [From the Introduction] The argument by which it is shown that, under a system of open competition, prices are determined in a way which secures to consumers a maximum aggregate of satisfaction consonant with the relative security of the means of production is the familiar material of many treatises on economics, and does not need to be repeated here. In Economics (as distinct from Politics) this argument provided in a simple form the logical justification for the advocacy of laissez faire in State policy during the early 19th century even though "it was the actual success of private enterprise and the inefficiency and corruption of Government control that caused laissez faire to be an acceptable policy". No-one, of course, contended that pure competition did in fact characterize the economic relations of the time. Quite the reverse. It was argued that if the hindrances to competition were removed, society as a whole would reap the benefits indicated by the theory.
- Full Text:
- Authors: Threlfell, R L
- Date: 1948
- Subjects: Agriculture and state -- South Africa
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:1107 , http://hdl.handle.net/10962/d1013399
- Description: [From the Introduction] The argument by which it is shown that, under a system of open competition, prices are determined in a way which secures to consumers a maximum aggregate of satisfaction consonant with the relative security of the means of production is the familiar material of many treatises on economics, and does not need to be repeated here. In Economics (as distinct from Politics) this argument provided in a simple form the logical justification for the advocacy of laissez faire in State policy during the early 19th century even though "it was the actual success of private enterprise and the inefficiency and corruption of Government control that caused laissez faire to be an acceptable policy". No-one, of course, contended that pure competition did in fact characterize the economic relations of the time. Quite the reverse. It was argued that if the hindrances to competition were removed, society as a whole would reap the benefits indicated by the theory.
- Full Text:
The oxidation and degradation products of black wattle tannin (Acacia mollissima)
- Authors: Heugh, Richard Anthony
- Date: 1948
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:21169 , http://hdl.handle.net/10962/6706
- Full Text:
- Authors: Heugh, Richard Anthony
- Date: 1948
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:21169 , http://hdl.handle.net/10962/6706
- Full Text:
A preliminary investigation of the determination of ionic mobilities by conductometric titration
- Authors: Festenstein, Gerald Norman
- Date: 1947
- Subjects: Ionic mobility , Conductometric analysis
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4472 , http://hdl.handle.net/10962/d1011810 , Ionic mobility , Conductometric analysis
- Description: The determination of ionic mobilities by conductometric titration was first suggested by Barker, Rowler and Shuttleworth in discussing the theory of conductometric titration of acids, bases and neutral salts. Intro. p. 1.
- Full Text:
- Authors: Festenstein, Gerald Norman
- Date: 1947
- Subjects: Ionic mobility , Conductometric analysis
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4472 , http://hdl.handle.net/10962/d1011810 , Ionic mobility , Conductometric analysis
- Description: The determination of ionic mobilities by conductometric titration was first suggested by Barker, Rowler and Shuttleworth in discussing the theory of conductometric titration of acids, bases and neutral salts. Intro. p. 1.
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A report on the comparative performance of coloured and European factory workers on four tests of ability
- Authors: Gough, Margaret Frances
- Date: 1947
- Subjects: Cross-cultural psychology , Employees -- South Africa , Colored people (South Africa) -- Psychology
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3246 , http://hdl.handle.net/10962/d1014980
- Description: This thesis is a report on the results or four psychological tests, applied to two groups or workers in Port Elizabeth factories; the one group consisting of European, the other of Coloured workers. The abilities selected for testing were believed to be necessary, to some extent, in certain Industrial operations.
- Full Text:
- Authors: Gough, Margaret Frances
- Date: 1947
- Subjects: Cross-cultural psychology , Employees -- South Africa , Colored people (South Africa) -- Psychology
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3246 , http://hdl.handle.net/10962/d1014980
- Description: This thesis is a report on the results or four psychological tests, applied to two groups or workers in Port Elizabeth factories; the one group consisting of European, the other of Coloured workers. The abilities selected for testing were believed to be necessary, to some extent, in certain Industrial operations.
- Full Text:
A study of the comparative anatomy of the lateral compound eyes of arthropods
- Authors: Glaholm, J
- Date: 1947
- Subjects: Arthropoda -- Anatomy
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5908 , http://hdl.handle.net/10962/d1014966
- Description: In this thesis the interest has centered mainly on the comparative anatomy of the lateral eyes of Arthropods especially the compound eyes, with some particular reference to those of Chilopoda. The comparative anatomy of the eyes of Chilopoda seemed to be of interest, since they possess in most cases simple lateral eyes, which are not characteristic of the adults of any other group of Arthropoda, except Arachnids, to which the Chilopoda are only remotely related In a few cases - in the Scutigeridae - "compound" eyes are present, which are very unusual in their internal anatomy. The following possibilities with regard to the relationships of the Chilopod eyes present themselves. The simple eyes may be the products of degeneration of a compound eye. Alternatively they may be ocelli of a very primitive pre-compound eye type, persisting where in some cases a compound eye has failed to develop. As a third possibility they may have been separately evolved in forms, in which the compound eye was lost or failed to develop. In the last case they would appear to be unrelated to those of any other Arthropods, except possibly those of Diplopods, to which they are very similar in structure. The "compound" eyes may be or the same type as the compound eyes in the remaining Arthropods, with the differences due to degeneration, or to specialisation. Alternatively they may be of a separate type and formed secondarily, either as a single new structure. or a coalescence of ocelli. The enquiry into the interrelationship of these eyes and their relation to the eyes of other Arthropoda raises several points for investigation. For the compound eyes it is necessary to decide whether they were primarily present in the ancestors of some or all of the classes or Arthropods, and whether they have a common or more or less diverse origin with some evolutionary convergence. For the lateral simple eyes it is necessary to decide whether there are any indications in phylogeny, ontogeny or anatomy of the primitive or secondary formation of a compound eye by the aggregation of numerous ocelli or the elaboration of one or these. Such information might be expected to throw light on the origin of the Scutigerid eye. Alternatively any indications of the formation of simple from compound eyes might show whether the Chilopod simple eyes could have evolved in this way from a Scutigerid or some other compound eye. Median eyes are present in some Trilobites, Eurypterida, Crustacea, Hexapods and Arachnida. Although they exhibit considerable variations in structure, they are all clearly simple eyes. As they are absent in Chilopoda and in the remaining Arthropods are entirely separate in origin from the lateral eyes, with a separate seat of innervation, their comparative anatomy is of little interest in this case. The main portion of the thesis deals with the comparative anatomy, origins and relationships of the different types of compound lateral eyes. The second part comprises a short appendix dealing with similar aspects of the lateral ocelli. Detailed descriptions and figures have been given for the eyes of eight species. Some mention is also made of points observed in the internal or external anatomy of species which were studied in less detail. The theoretical conclusions are based on material from the available literature and from these descriptions.
- Full Text:
- Authors: Glaholm, J
- Date: 1947
- Subjects: Arthropoda -- Anatomy
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5908 , http://hdl.handle.net/10962/d1014966
- Description: In this thesis the interest has centered mainly on the comparative anatomy of the lateral eyes of Arthropods especially the compound eyes, with some particular reference to those of Chilopoda. The comparative anatomy of the eyes of Chilopoda seemed to be of interest, since they possess in most cases simple lateral eyes, which are not characteristic of the adults of any other group of Arthropoda, except Arachnids, to which the Chilopoda are only remotely related In a few cases - in the Scutigeridae - "compound" eyes are present, which are very unusual in their internal anatomy. The following possibilities with regard to the relationships of the Chilopod eyes present themselves. The simple eyes may be the products of degeneration of a compound eye. Alternatively they may be ocelli of a very primitive pre-compound eye type, persisting where in some cases a compound eye has failed to develop. As a third possibility they may have been separately evolved in forms, in which the compound eye was lost or failed to develop. In the last case they would appear to be unrelated to those of any other Arthropods, except possibly those of Diplopods, to which they are very similar in structure. The "compound" eyes may be or the same type as the compound eyes in the remaining Arthropods, with the differences due to degeneration, or to specialisation. Alternatively they may be of a separate type and formed secondarily, either as a single new structure. or a coalescence of ocelli. The enquiry into the interrelationship of these eyes and their relation to the eyes of other Arthropoda raises several points for investigation. For the compound eyes it is necessary to decide whether they were primarily present in the ancestors of some or all of the classes or Arthropods, and whether they have a common or more or less diverse origin with some evolutionary convergence. For the lateral simple eyes it is necessary to decide whether there are any indications in phylogeny, ontogeny or anatomy of the primitive or secondary formation of a compound eye by the aggregation of numerous ocelli or the elaboration of one or these. Such information might be expected to throw light on the origin of the Scutigerid eye. Alternatively any indications of the formation of simple from compound eyes might show whether the Chilopod simple eyes could have evolved in this way from a Scutigerid or some other compound eye. Median eyes are present in some Trilobites, Eurypterida, Crustacea, Hexapods and Arachnida. Although they exhibit considerable variations in structure, they are all clearly simple eyes. As they are absent in Chilopoda and in the remaining Arthropods are entirely separate in origin from the lateral eyes, with a separate seat of innervation, their comparative anatomy is of little interest in this case. The main portion of the thesis deals with the comparative anatomy, origins and relationships of the different types of compound lateral eyes. The second part comprises a short appendix dealing with similar aspects of the lateral ocelli. Detailed descriptions and figures have been given for the eyes of eight species. Some mention is also made of points observed in the internal or external anatomy of species which were studied in less detail. The theoretical conclusions are based on material from the available literature and from these descriptions.
- Full Text:
Methods and policies of the distribution of footwear in South Africa
- Authors: Lipschitz, Gustav
- Date: 1947
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:21160 , http://hdl.handle.net/10962/6639
- Description: This thesis is mainly based on information obtained by discussion with footwear manufacturers, wholesale merchants, retailers and many other business men who were thoroughly acquainted with merchandising methods and policies. Many thanks to all those who assisted. Government Blue Books, other published and unpublished Reports and Economic and Trade journals were consulted wherever possible.
- Full Text:
- Authors: Lipschitz, Gustav
- Date: 1947
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:21160 , http://hdl.handle.net/10962/6639
- Description: This thesis is mainly based on information obtained by discussion with footwear manufacturers, wholesale merchants, retailers and many other business men who were thoroughly acquainted with merchandising methods and policies. Many thanks to all those who assisted. Government Blue Books, other published and unpublished Reports and Economic and Trade journals were consulted wherever possible.
- Full Text:
The high pressure catalytic hydrogenation of the tannin of black wattle (Acacia mollissima Willd)
- Authors: Silk, M H
- Date: 1947
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:21132 , http://hdl.handle.net/10962/6528
- Description: From Introduction: The wattle industry in South Africa has, from its commencement in the middle of the last century, gradually assumed a position of increasing importance in the economic structure of the country. Apart from the provision of a valuable tanning extract for home use and for export, the tree itself has proved of considerable importance to the Union’s mining industries. In addition there would appear to be possibilities for the utilisation in the near future, of the raw ground bark and the wattle extract for the manufacture of a number of by-products, including certain types of plastics.
- Full Text:
- Authors: Silk, M H
- Date: 1947
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:21132 , http://hdl.handle.net/10962/6528
- Description: From Introduction: The wattle industry in South Africa has, from its commencement in the middle of the last century, gradually assumed a position of increasing importance in the economic structure of the country. Apart from the provision of a valuable tanning extract for home use and for export, the tree itself has proved of considerable importance to the Union’s mining industries. In addition there would appear to be possibilities for the utilisation in the near future, of the raw ground bark and the wattle extract for the manufacture of a number of by-products, including certain types of plastics.
- Full Text:
The missionary work of the first Anglican Bishop of Natal, the Rt. Reverend John William Colenso, between the years 1852-1873
- Authors: Burnett, B B
- Date: 1947
- Subjects: Colenso, John William, 1814-1883
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2621 , http://hdl.handle.net/10962/d1014679
- Description: At the outset it had been my intention to make only the slightest of references to the Church Controversy in which Bishop Colenso was involved and to have touched only lightly on his theological position. Apart from anything else I hesitated to enter the arena in which so many had already collided violently and where my own prejudices might be enlisted on one side or the other. It became evident however that Colenso the Controversialist, the Theologian could not be dissociated from Colenso the missionary, without giving an inadequate, and even misleading history of his missionary activities. The Controversy had a serious and deleterious effect on his missionary work, and no estimate of the value of a missionary's labours would be valid without some consideration of his teaching, more especially when his orthodoxy is suspect. I have therefore dealt as briefly as I could with these questions in Chapter V because of their relevance, and because to produce a work on an ecclesiastic without some reference to his tenets would be like writing a biography of Louis Botha without any allusion to his political 'faith', or of Wellington, without any mention of Waterloo. it would represent a distortion of history to write about a Missionary Bishop as though he were an amateur politician, or of a missionary as though he were interested only in finance and administration.
- Full Text:
- Authors: Burnett, B B
- Date: 1947
- Subjects: Colenso, John William, 1814-1883
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2621 , http://hdl.handle.net/10962/d1014679
- Description: At the outset it had been my intention to make only the slightest of references to the Church Controversy in which Bishop Colenso was involved and to have touched only lightly on his theological position. Apart from anything else I hesitated to enter the arena in which so many had already collided violently and where my own prejudices might be enlisted on one side or the other. It became evident however that Colenso the Controversialist, the Theologian could not be dissociated from Colenso the missionary, without giving an inadequate, and even misleading history of his missionary activities. The Controversy had a serious and deleterious effect on his missionary work, and no estimate of the value of a missionary's labours would be valid without some consideration of his teaching, more especially when his orthodoxy is suspect. I have therefore dealt as briefly as I could with these questions in Chapter V because of their relevance, and because to produce a work on an ecclesiastic without some reference to his tenets would be like writing a biography of Louis Botha without any allusion to his political 'faith', or of Wellington, without any mention of Waterloo. it would represent a distortion of history to write about a Missionary Bishop as though he were an amateur politician, or of a missionary as though he were interested only in finance and administration.
- Full Text:
A critical examination of the evidence regarding the size of manufacturing units in the footwear industry of South Africa, Great Britain, Canada and the U.S.A. with an assessment of the economic implications and consequences of these conditions in relation to the South African customs tariff
- Authors: Brits, Rudolph N
- Date: 1946
- Subjects: Footwear industry -- South Africa , Footwear industry , Tariff -- South Africa
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:1080 , http://hdl.handle.net/10962/d1009755 , Footwear industry -- South Africa , Footwear industry , Tariff -- South Africa
- Description: Before the formation of Union in 1910 there were a few scattered boot and shoe factories in South Africa. Unfortunately, owing to lack of statistics, it is impossible to tell which of these establishments were actually manufacturing boots and shoes, and which were only engaged in repair work.
- Full Text:
- Authors: Brits, Rudolph N
- Date: 1946
- Subjects: Footwear industry -- South Africa , Footwear industry , Tariff -- South Africa
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:1080 , http://hdl.handle.net/10962/d1009755 , Footwear industry -- South Africa , Footwear industry , Tariff -- South Africa
- Description: Before the formation of Union in 1910 there were a few scattered boot and shoe factories in South Africa. Unfortunately, owing to lack of statistics, it is impossible to tell which of these establishments were actually manufacturing boots and shoes, and which were only engaged in repair work.
- Full Text:
Base exchange in soils : a study of the reproducibility of base exchange values for some South African soils, as indicated by leaching with normal ammonium acetate solution
- Authors: Pienaar, D J
- Date: 1946
- Subjects: Soil chemistry , Soils
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4489 , http://hdl.handle.net/10962/d1013038
- Description: A very reliable method for the total analysis of the ammonium acetate leachate has been outlined. This is both simple and straight forward and is more rapid than any which have been seen in the literature. It is particularly applicable where a worker must perform a large number of routine analyses in the minimum of time. Shirley (29) and other workers have shown that 1000 ml. of leaching solution is generally necessary to extract all the exchangeable gases. The present investigation has shown that the time of leaching makes no appreciable difference to the amounts of bases replaced, as long as this exceeds four hours. Two alternative methods have been introduced for the rapid determination of the total exchangeable bases in a soil and there are considered to be more reliable than that of Bray and White. It is suggested that the two new methods might yield a still greater degree of accuracy if larger aliquots were to be used for each determination. It is further pointed out that the values obtained by the chloride methods are more likely to represent correct values than the sum totals of the bases as determined individually, since these are arrived at by summing the results of four different estimations, each of which is liable to experimental error, whereas in the chloride methods there is only one perfectly straightforward determination. The values for the total exchangeable bases in the soils examined were found to vary over the range 2.50 to 14.28 m.e. per 100 g. soil, with a variance of up to ± 0.2sm.e. per 100 g., corresponding to a percentage error of up to ± 4.7%. These figures are based on the analysis of 12 separate leachings of each soil with normal ammonium acetate solution of pH 7.00. This rather wide variance can be attributed to the fact that the exchangeable bases in some soils are more easily replaceable than in other soils. It is regretted that the shortage of time and the non-availability of a complete range of samples of all typical South African soils has prevented the attainment of an original objective, namely, a statistical evaluation of the base exchange figures for all South African soil types. It would also have been of great interest to have been able to establish exactly the composition of the double salt of calcium and magnesium, whose existence has been postulated to explain the effect of the Ca/Mg ratio on the results yielded by the first chloride method. Summary, p. 67-68.
- Full Text:
- Authors: Pienaar, D J
- Date: 1946
- Subjects: Soil chemistry , Soils
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4489 , http://hdl.handle.net/10962/d1013038
- Description: A very reliable method for the total analysis of the ammonium acetate leachate has been outlined. This is both simple and straight forward and is more rapid than any which have been seen in the literature. It is particularly applicable where a worker must perform a large number of routine analyses in the minimum of time. Shirley (29) and other workers have shown that 1000 ml. of leaching solution is generally necessary to extract all the exchangeable gases. The present investigation has shown that the time of leaching makes no appreciable difference to the amounts of bases replaced, as long as this exceeds four hours. Two alternative methods have been introduced for the rapid determination of the total exchangeable bases in a soil and there are considered to be more reliable than that of Bray and White. It is suggested that the two new methods might yield a still greater degree of accuracy if larger aliquots were to be used for each determination. It is further pointed out that the values obtained by the chloride methods are more likely to represent correct values than the sum totals of the bases as determined individually, since these are arrived at by summing the results of four different estimations, each of which is liable to experimental error, whereas in the chloride methods there is only one perfectly straightforward determination. The values for the total exchangeable bases in the soils examined were found to vary over the range 2.50 to 14.28 m.e. per 100 g. soil, with a variance of up to ± 0.2sm.e. per 100 g., corresponding to a percentage error of up to ± 4.7%. These figures are based on the analysis of 12 separate leachings of each soil with normal ammonium acetate solution of pH 7.00. This rather wide variance can be attributed to the fact that the exchangeable bases in some soils are more easily replaceable than in other soils. It is regretted that the shortage of time and the non-availability of a complete range of samples of all typical South African soils has prevented the attainment of an original objective, namely, a statistical evaluation of the base exchange figures for all South African soil types. It would also have been of great interest to have been able to establish exactly the composition of the double salt of calcium and magnesium, whose existence has been postulated to explain the effect of the Ca/Mg ratio on the results yielded by the first chloride method. Summary, p. 67-68.
- Full Text:
The morphology and biology of Anomala vetula Wied : an arthropod pest of turf in South Africa
- Authors: Bradford, B
- Date: 1946
- Subjects: Anomala
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5903 , http://hdl.handle.net/10962/d1013545
- Description: From Introduction: For the past eight years, the Zoology Department of Rhodes University College, in co-operation with African Explosives & Chemical Industries Ltd., has been studying certain entomological problems relating to turf on the golf course along the coastal belt of the Eastern Cape Province. The position is briefly as follows:- On the golf courses at Mossel Bay, Humewood (Port Elizabeth), Port Alfred and East London, vast damage has been done to the greens and fairways by "white grubs", the larval stages of Scarabaeidae. It would appear that these beetles had been present in the environs of the courses for many years, but it was only when large areas of the natural veld were converted into fairways, with a more or less uniform cover of grass, with Cynodon dactylon Pers. predominating, that conditions were inadvertently created which favoured the development of the beetles. It was not long after the establishment of these golf courses, that the beetles assumed the proportions of a pest, and the larvae began destroying the root system of the grasses covering the greens and fairways.
- Full Text:
- Authors: Bradford, B
- Date: 1946
- Subjects: Anomala
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5903 , http://hdl.handle.net/10962/d1013545
- Description: From Introduction: For the past eight years, the Zoology Department of Rhodes University College, in co-operation with African Explosives & Chemical Industries Ltd., has been studying certain entomological problems relating to turf on the golf course along the coastal belt of the Eastern Cape Province. The position is briefly as follows:- On the golf courses at Mossel Bay, Humewood (Port Elizabeth), Port Alfred and East London, vast damage has been done to the greens and fairways by "white grubs", the larval stages of Scarabaeidae. It would appear that these beetles had been present in the environs of the courses for many years, but it was only when large areas of the natural veld were converted into fairways, with a more or less uniform cover of grass, with Cynodon dactylon Pers. predominating, that conditions were inadvertently created which favoured the development of the beetles. It was not long after the establishment of these golf courses, that the beetles assumed the proportions of a pest, and the larvae began destroying the root system of the grasses covering the greens and fairways.
- Full Text:
The preservation and standardisation of South African hides and skins
- Authors: Kritzinger, Carl Cronje
- Date: 1946
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:21052 , http://hdl.handle.net/10962/6157
- Description: During the past fifty years the problems of the leather industry have been tackled from various aspects by scientific research workers all over the world, and "works control" today forms one of .the important foundation stones of efficiently run tanneries and footwear factories. The raw materials of the tanning industry, hides and skins, constitute the largest proportion of the cost of production, and it is ' only natural that the improvement of these valuable raw materials should be given primary attention by any leather scientist. Until only a few years ago, however, the South African hide and skin industry was at a serious ·disadvantage in that it had to base recommendations for improved production methods almost exclusively on overseas experience and practice. The importance of the differences existing between South Africa and European or American countries with regard to climate, slaughtering, hide and skin production in general, transport and sale, however, necessitates a different approach to our specific problems. The overseas hide and skin industry has had, since the beginning of this century, the support and particularly the guidance of scientific research; but it was not until 1935, when, through the support of the Hide and Skin advisory Board, Prof. W. F. Barker founded the original Tanning, Hides and Skins Research Department at Rhodes University College, Grahamstown, that science actively entered the field of hide and skin production in this country. Much of the work done had of course to be based on the results obtained by overseas research institutions, and the adaptation of such results to suit our own problems for some time formed a considerable part of the investigations undertaken. This thesis embodies the results of work undertaken by the writer since 1943 on specific problems of the South African hide and skin industry. Much of the work has already received publication through the Circulars and Journals of this Institute, but it is embodied here again in order to maintain the continuity. The attitude throughout has been to evolve methods of production suited to our own conditions, and the adoption of the recommendations contained in this thesis should lead to improvement in the quality of our hides and skins. Much still remains to be done, and it is the sincere hope of the writer that this work will stimulate and form the basis for subsequent investigations. For that reason more or less detailed descriptions are given of all experiments conducted, and the theory of curing in its relation to tanning is briefly discussed . The literature in each of the four Parts has been attached at the end of that Part to facilitate reference work. At the same time, however, the writer kept in mind the requirements of the trade itself, therefore much of the work is discussed in popular terms. It is hoped that the correct balance between the two extremes has been arrived at.
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- Authors: Kritzinger, Carl Cronje
- Date: 1946
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:21052 , http://hdl.handle.net/10962/6157
- Description: During the past fifty years the problems of the leather industry have been tackled from various aspects by scientific research workers all over the world, and "works control" today forms one of .the important foundation stones of efficiently run tanneries and footwear factories. The raw materials of the tanning industry, hides and skins, constitute the largest proportion of the cost of production, and it is ' only natural that the improvement of these valuable raw materials should be given primary attention by any leather scientist. Until only a few years ago, however, the South African hide and skin industry was at a serious ·disadvantage in that it had to base recommendations for improved production methods almost exclusively on overseas experience and practice. The importance of the differences existing between South Africa and European or American countries with regard to climate, slaughtering, hide and skin production in general, transport and sale, however, necessitates a different approach to our specific problems. The overseas hide and skin industry has had, since the beginning of this century, the support and particularly the guidance of scientific research; but it was not until 1935, when, through the support of the Hide and Skin advisory Board, Prof. W. F. Barker founded the original Tanning, Hides and Skins Research Department at Rhodes University College, Grahamstown, that science actively entered the field of hide and skin production in this country. Much of the work done had of course to be based on the results obtained by overseas research institutions, and the adaptation of such results to suit our own problems for some time formed a considerable part of the investigations undertaken. This thesis embodies the results of work undertaken by the writer since 1943 on specific problems of the South African hide and skin industry. Much of the work has already received publication through the Circulars and Journals of this Institute, but it is embodied here again in order to maintain the continuity. The attitude throughout has been to evolve methods of production suited to our own conditions, and the adoption of the recommendations contained in this thesis should lead to improvement in the quality of our hides and skins. Much still remains to be done, and it is the sincere hope of the writer that this work will stimulate and form the basis for subsequent investigations. For that reason more or less detailed descriptions are given of all experiments conducted, and the theory of curing in its relation to tanning is briefly discussed . The literature in each of the four Parts has been attached at the end of that Part to facilitate reference work. At the same time, however, the writer kept in mind the requirements of the trade itself, therefore much of the work is discussed in popular terms. It is hoped that the correct balance between the two extremes has been arrived at.
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A preliminary investigation of the chemical nature of wattle tannin
- Authors: Corbett, John Henry
- Date: 1945
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:21062 , http://hdl.handle.net/10962/6201
- Description: From Introduction: Although the tannins of wattle bark extract are generally considered to be of the class known as condensed tannins, a review of the general chemical nature of the tannins is given for the sake of completeness. This constitutes Part I of the thesis. Part II describes the preliminary investigation of the chemical nature of black wattle extract.
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- Authors: Corbett, John Henry
- Date: 1945
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:21062 , http://hdl.handle.net/10962/6201
- Description: From Introduction: Although the tannins of wattle bark extract are generally considered to be of the class known as condensed tannins, a review of the general chemical nature of the tannins is given for the sake of completeness. This constitutes Part I of the thesis. Part II describes the preliminary investigation of the chemical nature of black wattle extract.
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A study of the errors involved in the sampling of soils
- Steyn, Willem Johannes Abraham
- Authors: Steyn, Willem Johannes Abraham
- Date: 1945
- Subjects: Soils -- Analysis , Soil chemistry
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4505 , http://hdl.handle.net/10962/d1013290
- Description: The importnnce of representative soil sampling is now beginning to receive more general recognition. The analysis of the sample, and any chemical or physical treatment it may undergo in the laboratory, is of little practical value if it is not known with reasonable certainty that this sample represents fairly the area from which it as taken. It has been said over and over again, that the existence of the world's whole civilization is dependent upon a mere strip of soil, only 9 inches in depth. The study of the soil is therefore of special importance if only for the practical end of replacing any nutrient deficiencies which may be found. Intro., p. 1.
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- Authors: Steyn, Willem Johannes Abraham
- Date: 1945
- Subjects: Soils -- Analysis , Soil chemistry
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4505 , http://hdl.handle.net/10962/d1013290
- Description: The importnnce of representative soil sampling is now beginning to receive more general recognition. The analysis of the sample, and any chemical or physical treatment it may undergo in the laboratory, is of little practical value if it is not known with reasonable certainty that this sample represents fairly the area from which it as taken. It has been said over and over again, that the existence of the world's whole civilization is dependent upon a mere strip of soil, only 9 inches in depth. The study of the soil is therefore of special importance if only for the practical end of replacing any nutrient deficiencies which may be found. Intro., p. 1.
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Interrelations between learning abilities in various situations
- Authors: Lundie, Carol Frances
- Date: 1942
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:21159 , http://hdl.handle.net/10962/6629
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- Authors: Lundie, Carol Frances
- Date: 1942
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:21159 , http://hdl.handle.net/10962/6629
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The determination of selenium and tellurium in blister copper and copper concentrates
- Gray, Douglas James Skirving
- Authors: Gray, Douglas James Skirving
- Date: 1940
- Subjects: Selenium , Tellurium , Copper
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4478 , http://hdl.handle.net/10962/d1012090
- Description: Selenium and tellurium do not occur to any great extent in Nature and they are seldom studied in any detail. However, a general understanding of their properties, both physical and chemical, is essential in an investigation of their analytical determination. A general account may be found in many of the text-books on inorganic chemistry, but the following resumè has been included in this dissertation for the sake of completeness.
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- Authors: Gray, Douglas James Skirving
- Date: 1940
- Subjects: Selenium , Tellurium , Copper
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4478 , http://hdl.handle.net/10962/d1012090
- Description: Selenium and tellurium do not occur to any great extent in Nature and they are seldom studied in any detail. However, a general understanding of their properties, both physical and chemical, is essential in an investigation of their analytical determination. A general account may be found in many of the text-books on inorganic chemistry, but the following resumè has been included in this dissertation for the sake of completeness.
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The governorship of Sir Galbraith Lowry Cole
- Authors: Scheepers, Unus
- Date: 1940
- Subjects: Cole, Galbraith Lowry, Sir, 1772-1842 , Colonial administrators -- South Africa -- Cape of Good Hope , Cape of Good Hope (South Africa) History -- 1814-1835 , Cape of Good Hope (South Africa) -- Race relations , Slaves -- Emancipation -- South Africa -- Cape of Good Hope , Xhosa (African people) -- History -- 19th century , Xhosa (African people) -- Colonization -- South Africa -- Cape of Good Hope , Khoikhoi (African people) -- History -- 19th century
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2600 , http://hdl.handle.net/10962/d1007899 , Cole, Galbraith Lowry, Sir, 1772-1842 , Colonial administrators -- South Africa -- Cape of Good Hope , Cape of Good Hope (South Africa) History -- 1814-1835 , Cape of Good Hope (South Africa) -- Race relations , Slaves -- Emancipation -- South Africa -- Cape of Good Hope , Xhosa (African people) -- History -- 19th century , Xhosa (African people) -- Colonization -- South Africa -- Cape of Good Hope , Khoikhoi (African people) -- History -- 19th century
- Description: From Conclusion: There were no great upheavals during Cole's governership, but his rule has been a very interesting study. The old order of things was coming to a close. The way was prepared under Cole for freeing of the slaves; and the old despotic rule became a thing of the past. The British Settlers agitated for and obtained a free press; thus the foundation was laid for democratic institutions. He was the first governor to lay emphasis on the necessity of municipal councils not only as a way of decreasing expenditure, but also as a school for representative government. The Boers were becoming race conscious and the present orientation of the political parties had their origin in this period, though subsequent events have made the political struggle embittered. Above all the stage was being set for the Great Trek and the opening up of the whole of the present Union of South Africa and Rhodesia ... Last but not least the native question was entering upon its modern phase. Chiefs were losing their power, they admitted that they could not control their subjects, and natives were entering the service of Europeans; not only to steal with greater impunity but also to be able to enjoy the security offered by a well organised and disciplined society.
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- Authors: Scheepers, Unus
- Date: 1940
- Subjects: Cole, Galbraith Lowry, Sir, 1772-1842 , Colonial administrators -- South Africa -- Cape of Good Hope , Cape of Good Hope (South Africa) History -- 1814-1835 , Cape of Good Hope (South Africa) -- Race relations , Slaves -- Emancipation -- South Africa -- Cape of Good Hope , Xhosa (African people) -- History -- 19th century , Xhosa (African people) -- Colonization -- South Africa -- Cape of Good Hope , Khoikhoi (African people) -- History -- 19th century
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2600 , http://hdl.handle.net/10962/d1007899 , Cole, Galbraith Lowry, Sir, 1772-1842 , Colonial administrators -- South Africa -- Cape of Good Hope , Cape of Good Hope (South Africa) History -- 1814-1835 , Cape of Good Hope (South Africa) -- Race relations , Slaves -- Emancipation -- South Africa -- Cape of Good Hope , Xhosa (African people) -- History -- 19th century , Xhosa (African people) -- Colonization -- South Africa -- Cape of Good Hope , Khoikhoi (African people) -- History -- 19th century
- Description: From Conclusion: There were no great upheavals during Cole's governership, but his rule has been a very interesting study. The old order of things was coming to a close. The way was prepared under Cole for freeing of the slaves; and the old despotic rule became a thing of the past. The British Settlers agitated for and obtained a free press; thus the foundation was laid for democratic institutions. He was the first governor to lay emphasis on the necessity of municipal councils not only as a way of decreasing expenditure, but also as a school for representative government. The Boers were becoming race conscious and the present orientation of the political parties had their origin in this period, though subsequent events have made the political struggle embittered. Above all the stage was being set for the Great Trek and the opening up of the whole of the present Union of South Africa and Rhodesia ... Last but not least the native question was entering upon its modern phase. Chiefs were losing their power, they admitted that they could not control their subjects, and natives were entering the service of Europeans; not only to steal with greater impunity but also to be able to enjoy the security offered by a well organised and disciplined society.
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The development of native policy in the Transkei and in Glen Gray between 1870 and 1900
- Authors: Griffiths, M S
- Date: 1939
- Subjects: Transkei (South Africa) -- History , Black people -- South Africa -- Legal status, Laws, etc. -- South Africa -- History
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2607 , http://hdl.handle.net/10962/d1012098 , Transkei (South Africa) -- History , Black people -- South Africa -- Legal status, Laws, etc. -- South Africa -- History
- Description: The Transkeian Territories extend over a stretch of 17000 square miles between the north eastern border of the Cape Colony and the southern border of Natal. In 1870 this was an exclusively Native area ; inhabited by some half million natives tribally organised under independent chiefs and grouped into racial entities according to origln; customs, and language dialects.
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- Authors: Griffiths, M S
- Date: 1939
- Subjects: Transkei (South Africa) -- History , Black people -- South Africa -- Legal status, Laws, etc. -- South Africa -- History
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2607 , http://hdl.handle.net/10962/d1012098 , Transkei (South Africa) -- History , Black people -- South Africa -- Legal status, Laws, etc. -- South Africa -- History
- Description: The Transkeian Territories extend over a stretch of 17000 square miles between the north eastern border of the Cape Colony and the southern border of Natal. In 1870 this was an exclusively Native area ; inhabited by some half million natives tribally organised under independent chiefs and grouped into racial entities according to origln; customs, and language dialects.
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