. Optical projection : a treatise on the use of the lantern in exhibition and scientific demonstration. c III 11 III. Fig. 159 half of its height higher than the other, the effect of eachprism separately, and of the combination, and of the unde-flected beam, can be shown together, this arrangement beingshown at c, fig. 160. More simply, a pair of small prisms to show achromatism,as made for the Science and Art Department, and sold for 5s.,may be simply bound round with a rubber ring and stood LIGHT: COLOUR 293 on end in the path of the beam, the effects of each prismsingly being first
. Optical projection : a treatise on the use of the lantern in exhibition and scientific demonstration. c III 11 III. Fig. 159 half of its height higher than the other, the effect of eachprism separately, and of the combination, and of the unde-flected beam, can be shown together, this arrangement beingshown at c, fig. 160. More simply, a pair of small prisms to show achromatism,as made for the Science and Art Department, and sold for 5s.,may be simply bound round with a rubber ring and stood LIGHT: COLOUR 293 on end in the path of the beam, the effects of each prismsingly being first shown. Compound fluid prisms are very useful for many experi-ments with the spectrum. Fig. 161 is the usual form, thespace b being filled with carbon disulphide, or monobromo-naphthalene, or phenyl-thiocarbimide, and the ends g, oflight crown glass. Similar prisms of smaller size may be
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Keywords: ., bookauthorwrightle, bookcentury1900, bookdecade1900, bookyear1906