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 390
ysicalobservatory at Potsdam; and Cookes, a 25-inchrefractor now mounted atCambridge, England.Within recent years, Cookehas been offering a newphoto-visual objective, atriple glass said to be free TRIPLE objective (taylor) from the troublesome SeC- {Photographic and visual foci are ondary spectrum… … 332 Stars and Telescopes Jena glass, made from the formulae of Professor Abbeof the University of Jena, who conducted a courseof experiments under the auspices of the Germangovernment. The secondary spectrum gives rise to an effectwhich becomes especially harmful in very largeobjectives,…
Astronomy
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