Stars and telescopes; a hand-book of popular astronomy founded on the 9th ed. of Lynn's Celestial motions (1901)
Todd, David P. (David Peck), 1855-1939, Lynn, William Thynne, 1835-1911 · Boston, Little, Brown · leaf 416
o ^, c • :< F- ** * 2; fcs Z *„ X %J Z <o <■ - 2 -V O <o OS O *, (J t/) ■si tt H < s I. ° 8 < co r-O a a. Ou. wu > w o R8 s 2 £ < Telescopes and Houses for Them 363 bright inner corona would otherwise be. In the de-vice illustrated opposite, three concentric rings and… … THE ELECTRIC COMMUTATOR (TODD){Amherst Eclipse Expedition to Japan, 1896) Instead of pneumatic operation, the necessary move-ments, about 500 in all, were secured at the criticalinstants by the control of an electric commutator 364 Stars and Telescopes I* Si * COCO CI K fc <s (preceding page).…
Astronomy
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