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 390
the visual object-glass is 56 feet; Telescopes and Houses for Them hj 48 feet when the photographic corrector is applied.The Yerkes objective weighs about half a ton, and itscrown lens is three inches thick at the centre. Thetotal cost of this telescope, inclusive of its mountingwas about $125,000.… … YERKES OBSERVATORY OF THE UNIVERSITY OF CHICAGO {Located on the shore of Lake Geneva, Williams Bay, Wisconsin. Thisobservatory contains the largest refracting telescope in the world, was 5years in building, and cost about $500,000, the gift ofM* Chas. T. Yerkes) Clarks the signal honor of the…
Astronomy
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
