Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 419
ion withoutdispersion. 896 STARGAZING : PAST AND PRESENT. [BUUK VI. Fig. 173 is a drawing of a spectroscope containingfour j^risms. It is a representation of that used byBunsen and KirchliofF when they made their maps ofthe solar spectrum : it is so arranged that the light afterpassing through the… … Fig. 173.—Spectroscope with Pour Prisms. prisms, to be able to arrange them so that whether weuse one part of the spectrum or the other, eacli prismshall be in the best condition for allowing the light totraverse it; that is to say, that it shall be in theposition of minimum deviation, wdien the…
Astronomy · Telescopes
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