Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 351
3. A Pure Spectrum. It is often inconvenient to use sunlight for this experiment,and we may substitute for itthe light fi-om a projectinglantern. A suitable arrangement isillustrated in Fig. 402. Thelight emerges from a narrowvertical slit in the nozzle ofthe lantern, and then passesthrough a… … Fig. 402.—Showing how to produce a purespectrum. COLOURS OF NATURAL OBJECTS 341 The spectrum thus produced is pvurer tlian tliat obtained by-Newtons simple method. Imagine the round hole used byNewton to be divided up into narrow strips parallel to theedge of the prism. Each strip will produce a…
Physics
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