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 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, 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.
| Awards by International Juries. | |
| St. Louis | 1 Silver Medal. 2 Bronze Medals. |
| Brussels | 1 Gold Medal. 3 Silver Medals. |
| Turin | Diploma of Honour. 1 Gold Medal. 1 Silver Medal. |
Awards by Scientific Societies.
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.