any coloured light—whether homo-geneous or mixed—can be accurately determined. In ourillustration (Fig. 8) we have a simple form of spectroscopeby Browning with one prism, and Fig. 9 with two prisms.The instrument is firmly fixed upon an iron stand. Thecoloured light to be examined enters by the… … fl Fig. 9.—Two prism spectroscope. ■ is made to pass through a convex or collimator lens, wherebythe rays of light are made parallel before entering the prism.By this arrangement a purer spectrum is obtained. Thelight, having been refracted and decomposed in passingthrough the prism or prisms, is…
Color in the textile industries · Dyes and dyeing
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