The elements of physiological physics The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology elementsofphysio00mgre Year: 1884 PHYSIOLOGICAL PHYSICS. [Chap. xxvi. prisms and lenses for the purpose of readily obtaining spectra. The chief parts of it are a slit s, a prism p, and a telescope L. Through the slit a narrow beam of light is permitted to fall on the prism, which produces the dispersion. A person looking through the tele- scope sees an image of the spectrum. More than this Fig. 150.—The Spe
The elements of physiological physics The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology elementsofphysio00mgre Year: 1884 PHYSIOLOGICAL PHYSICS. [Chap. xxvi. prisms and lenses for the purpose of readily obtaining spectra. The chief parts of it are a slit s, a prism p, and a telescope L. Through the slit a narrow beam of light is permitted to fall on the prism, which produces the dispersion. A person looking through the tele- scope sees an image of the spectrum. More than this Fig. 150.—The Spectroscope. simple arrangement is used, however, in the construc- tion of spectroscopes. In order that the rays coming from the slit may be parallel a collimator is interposed between the slit and the prism. This is a convex lens I. It is fitted in a tube, at the outer end of which is the slit (narrow, and cleanly cut, and placed vertically), and it is distant its focal length from the slit, so that the rays of light from the slit pass through the lens and emerge parallel. The prism is placed with its edge parallel to the slit, and receives the rays from the collimator. Further, a convex lens may be placed between the source of light and the slit to concentrate the light on the slit, and thus obtain greater brilliancy. The dispersed rays fall 011 the telescope, placed to
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