Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 451
in Fig. 192 ; or the prisms may be made sotall that the light may be sent backwards and for-w^ards many times by means of return prisms, to whichreference has been already made. For the observation of those bodies which orive a small 428 STARGAZING: PAST AND PRESENT. [BOOli VI. amount of liglit,… … Fig. 193.—Solar Spectroscope (Brownings form). test the lines; whether any line of Sirius, for instance,is due to the vapour of magnesium, as Kirchhoff testedwhether any line in the sunlight was referable to iron orthe other vapours which he subsequently studied.
Astronomy · Telescopes
Internet Archive · Wellesley College Library · Public Domain Mark 1.0. Free to use for anything.
