Jones, H. Spencer (Harold Spencer), 1890- · London E. Arnold & co. · leaf 222
separateparallel beam. The light, therefore, emerging from the prismor reflected from the grating consists of a series of parallelbundles of different wave-lengths traveUing in shghtly differentdirections. The telescope focusses each of these as a hneimage, parallel to the original slit, and the… … Eyepiece Fig. 69.—Diagram of Single Prism Spectroscope. straight and sharply defined. In Fig. 69, B and J? representthe foci for the blue and red rays respectively. A spectroscope may be attached to the end of an equatorialtelescope in order to obtain the spectra of stars. The image ofthe star…
Astronomy
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