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 396
visual object-glass is 56 feet;. Telescopes and Houses for Them 337 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. v… … 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 5.years in building, and cost about $500,000, the gift of Mr Chas. T. Yerkes) Clarks the signal honor of the…
Astronomy
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