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, and divided to obtain lesser intensities.
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:--
Or. = R. + Y. Gr. = Y. + B. Vi. = B. + R.
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 writer’s method is giving entire satisfaction.
St. Louis 1 Silver Medal. 2 Bronze Medals.
Turin Diploma of Honour. 1 Gold Medal. 1 Silver Medal.
Sanitary Institute of Great Britain-- _Bronze_ Medal for Colourometrical Water Analysis.
Royal Sanitary Institute-- _Bronze_ Medal for Measuring Smoke Densities.
International Congress on School Hygiene-- _Bronze_ Medal for Colour Educator.
Royal Sanitary Institute-- _Silver_ Medal for 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.
Royal Sanitary Institute-- _Silver_ Medal for recent developments.
Royal Sanitary Institute-- _Silver_ Medal Corbett’s Radiometer.
Formal Adoption of Tintometer Standards by--
The Petroleum Industry. The Massachusetts Board of Health. The International Association of Leather Trades Chemists. The Inter-states Cotton Seed Oil Association. The Bureau of Engraving and Printing, China.
In general use by the following Industries--
Brewing and Malting. Tanning. Wine and Spirit Merchants. Dyeing and Printing. Paint, Oil and Varnish Merchants. Millers. Water Works Chemists. Ceramic Works. For estimating per cent. of Carbon in Steel. For estimating per cent. of Ammonia. For estimating Colours for Anthropological Classifications. For estimating Smoke Densities. For estimating Haemoglobin in the Blood. For estimating Colour of Whale Oil, etc., etc.