Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 417
nd is viewed there ; and in the otherthe eye is placed where the screen is, and looks throughthe prism and certain lenses at the slit. The great improvement which Mr. Simms suggestedwas this simple one. He said, It would surely bebetter that the light which passes through the prism orprisms… … Fig. 172. — Section of a Spectroscope, sliouing tlie Path of the Ray from the Slit. between the slit and the prism, insert an object-glass,as shown in Fig. 172 ; so that the slit of the spectro-scope is the representative of the hole in the shutter. The slit is exactly in the focus of the little…
Astronomy · Telescopes
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