. The Ontario high school physics. Fio. 41C.—A simple method of pro-fluoirif^ a pure spectrum. L ia thelight source behind a slit S, and SPia about 10 Fia. 417.—A sing^leprism spectroscope. Fig. 418 —A horizontal section of asing-le-prism spectroscope. If a small telescope is placed between tlio prism and theeye, and focussed on the slit, the spectrum will be seen tobetter advantage. But the most satisfactory method is to use a spectroscope,which is an instrument especially designed to examine thespectra of various sources. A simple form is illustrated inFig. 417 and a sectional plan is
. The Ontario high school physics. Fio. 41C.—A simple method of pro-fluoirif^ a pure spectrum. L ia thelight source behind a slit S, and SPia about 10 Fia. 417.—A sing^leprism spectroscope. Fig. 418 —A horizontal section of asing-le-prism spectroscope. If a small telescope is placed between tlio prism and theeye, and focussed on the slit, the spectrum will be seen tobetter advantage. But the most satisfactory method is to use a spectroscope,which is an instrument especially designed to examine thespectra of various sources. A simple form is illustrated inFig. 417 and a sectional plan is given in Fig. 418. The tube 350 DISPERSION, COLOUR, SPECTRUM ANALYSIS C, known as the collimator, has a slit S at one end and a lensL at the other. The slit is at the focus of the lens, so that thelight emerging from the tube is a parallel beam. It thenpasses through the prism P, and is received in a telescope T,the lens 0 of which focusses the spectrum in the plane ah. Itis then viewed by the eye-piece E. The light to be examined is jDlaced before 8. Usually athird tube R, is added. This has a small transparent scale viat one end and a lens at t
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishe, booksubjectphysics
