a simple reflecting prism for allowing twospectra to be examined side by side simultaneously. This little device is useful where two different absorptionspectra are to be carefully compared with each other, orwhere the spectrum of white light is wanted for comparison.For colour chemists a most… … ■ Fig, 10.—Direct vision spectroscope. scope, made also by Browning of London, gives wonderfulresults, considering its small size. The compound prism is placed inside the brass tube, at oneend of which is the slit for admitting the light. This canbe widened or narrowed at pleasure by turning round…
Color in the textile industries · Dyes and dyeing
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