Benedikt, Rudolf, 1852-1896, Knecht, Edmund, 1861-1925 · London : G. Bell and Sons · leaf 23
me phenomena are in general observed as the solutions of the corresponding colouring matters show when in a state of solution. In both cases, an absorption- spectrum is obtained ; but the one given by the solution is the purer, because it does not contain the admixture of white light which is… … Fig. 5. according to the degree of absorption, and leaving those parts white which allow the rays to pass unchanged ; or by indicating the spectrum by a horizontal line and ex- pressing the intensity of the absorption in each point by means of co-ordinates. Fig. 5 shows, for the purpose of…
Coal-tar colors
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