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 397
pectroscope in examining the chro-matic condition of an objective. So great was theimprovement that an exposure of one second gave animage of Castor, which required ten seconds in the un-corrected telescope. Rutherfurd later demonstratedthe feasibility of converting any visual objective intoa… … RUTHERFURD (1816-1S92) Telescopes and Houses for Them 345 August, 18 71, the first photographs of the sun, show-ing the minute granulations of its surface. His picturesof sunspots have not yet been surpassed (page 52),and his lunar photographs compare favorably withrecent work at Paris and Mount…
Astronomy
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
