Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 421
f thespectrum; and of course this enables us, in the case oftlie sun especially, to increase the dispersion almostwithout limit, by having a great number of prisms, oreven using the same twice over, in the following manner:On the spectroscope there is a number of prisms soarranged that the light… … Fkj. 176.—Last riisiii of Train fur retTiriiiiie tlie Ilavs. sent up to another reflecting surface, and then comesback again through the same prisms along an upperstorey, and then is caught by means of a telescope abovethe collimator, on the slit of which the suns imageis allowed to fall. This…
Astronomy · Telescopes
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