Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 428
t ; E, electro-magnet round wliich the current passes when thepoles are at the proper distance a]iart, causing it to attract the armature a. less rich in vibrations, and therefore instead of gettingrays of all refrangihilities we only get rays of so7ne. CHAP. XXV]II.] THE CHEMISTRY OF THE STARS.… … Fig. 180.—Electric Lamp arranged for tliromng a spectrum ou a screen, d, lens ;E e, bisulphide of carbon prisms. prisms of glass containing bisulphide of carbon areplaced in the beam after it has traversed the lens, whichdraw out the image of the slit into a spectrum. Wecan then place a piece of…
Astronomy · Telescopes
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