THE GREAT LICK TELESCOPE.
Professor A. C. Young, in Scientific News, says: The object-glass of the great Lick telescope is now practically completed, and only awaits examination and approval by the experts who are to bo appointed by tho Lick trustees to test it. This enormou^ lens, by far tho largest ever made, is thirty-six inches in diameter, and has a focal length of fiftyseven feet. It is composed of two lenses, of which the front one (outside) in au equi-convox. lens of crown irhiss, while the other is a concave lens of flint gla«s ; one «ide of this — the Fide next tho eye — is very slightly concave — iv faor, almost flat ; the other next the crown-grass lens is considerably concave, tho oonvature being somewhat deeper that of the crownglass surface?. The i»nor surfaces of tho two lens aro sepnrated by a clear airspace of about six and a-half inches, and there are perforations in the cell that allow a free circulation of air between them. The glass disks woro mado by Feil, of Paris, and they havo been figurod and workod by our own clerks at their modest but famous esttiblißbmout in Cambridge-port.
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Waikato Times, Volume XXVII, Issue 2242, 20 November 1886, Page 2 (Supplement)
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194THE GREAT LICK TELESCOPE. Waikato Times, Volume XXVII, Issue 2242, 20 November 1886, Page 2 (Supplement)
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