LIGHT AND COLOUR THEORIES and their Relation to Light and Colour Standardization - CONTENTS - PAGE CHAPTER VII I. CHAPTER CHAPTER X. REPRESENTATION O S F COLOUR I N SPACE O F THREE D IMEN SIONS 34 CHAPTER XI. THE S PECTRU I M N RELATION TO COLOURS TANDARDIZATIOK 36 CHAPTER XTI. THEP HYSIOLOGI L C I A G I H , TU NIT . 45 APPENDIX 1, COLOUR EDUCATION APPENDIX 11. APPENDIX 111. LIST OF PLATES TO FACE PAGE ,, IV. FIRST S YSTEM O F CHARTINGC OLOUR . 31 y J VI. SIX TINTOMETRIC C A OL L O URC HARTS . 39 P 9 1 1 Two CIRCLES . 40 VIII. ABSORPTION CURVES OF DYES . 76 , P XI. SPECIFICC OLOUR CURVES OF HEALTHY AN D DISEASED H UMAN BL OOD . 82 vii -- PURPOSE -- THE purpose of this work is to demonstrate that T colour is a determinable property of matter, and to make generally known methods of colour analysis and synthesis which have proved of great practical value in establishing standards of purity in some industries. I The purpose is also to show that the methods are thoroughly scientific in theory and practice, and that the results are not likely to be changed by further discoveries. Also that out of the work done a new law has been developed, which the writer calls the Law of Specific Colour Development, meaning that every substance has its own rate of colour development for regularly increasing thicknesses. THE THEORY. Of the six colours in white light-red, orange, yellow, green, blue and violet Red, Yellow and Blue are regarded as dominants, because they visually S hold the associated colours orange, green and violet in subjection. . An equivalent unit of pure red, pure yellow and . pure blue is adopted, and incorporated into glass. The unit is multiplied to obtain greater intensities, a. nd divided to obtain lesser intensities. ix X PURPOSE The coloured glasses are called absorbents. The red absorbent transmits violet, red and orange, but the red ray alone is visible as colour, until the other absorbents are superimposed, and the character of the group of rays changed. In the same way yellow transmits orange and green, and blue transmits green and violet, whilst the yellow and blue alone are visible as colour. Orange, green and violet are here called subordinates, which may be developed as follows -Twenty-five years experience in the application of the theory and the method to the. requirements of practical work, have given no reason for change. Following will be found a list of awards from International Juries and Scientific Societies, also a list of industries in which the writers method is giving entire satisfaction. Awards by international Juries. St. Louis. . . I Silver Medal. 2 Bronze Medals. Brussels . . I Gold Medal. . 3 Silver Medals. Turin . Diploma of Honour. I Gold Medal. I Silver Medal. Awards by Scientific Societies. Sanitary Institute of Great Britain-Bronze Medal for olouro etrical Water Analysis. Royal Sanitary Institute-Bronze Medal for Measuring Smoke Densities. International Coqlgress on School Hygiene-Bronze Medal for Colour Educator. PURPOSE Royal Sanitary Institute-Silver e d aflo r Colour Educator. Smoke Abatement Society, Sheffield-Diploma for System of Colour Measurement. Royal Sanitary Institute-Bronze Medal for Quantitative Estimation of Colour Blindness. Franco-British Exhibition-Gold Medal for Colour Educator. International Medical Congress-Bronze Medal for Tintometer as Medical requisite...