Stars and telescopes; a hand-book of popular astronomy, founded on the 9th ed. of Lynn's Celestial motions (1899)
Todd, David P. (David Peck), 1855-1939, Lynn, William Thynne, 1835-1911. Celestial motions · Boston, Little, Brown and company · leaf 111
(Article Screw, Eucydopcedia Britannica, 9th edi-tion.) The perfect gratings ruled with this engine are nowsupplied to physicists all over the world. By means of a spectroscope properly arranged with suitableaccessories, the Suns spectrum has been both delineated andphotographed alongside of the… … professor Rowlands ruling engine in Scotland, and in America Rowland, Young, Trowbridge,and Hutchins. Their research, together with that of previousinvestigators, principally Kirchhoff and Angstrom, Vogeland Fievez, has led to the certain detection of at least 35 ele-mental substances in the Sun,…
Astronomy
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