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 386
hemequalling about £ their diameter. This constructionadds to the weight of the mounted objective, butaffords better correction of the aberration, permitseasy cleaning of the inner faces, and allows free circu- Telescopes and Houses for Them 333 lation of air between flint and crown. In all… … 27-INCH VIENNA EQUATORIAL(Built by Sir Howard Grubb) embracing a 27-inch telescope complete (illustratedabove), and mounted at the Imperial Observatory ofVienna, one of the best equipped establishments ofEurope. Also he has constructed a 26-inch visual anda 28-inch photographic objective for the…
Astronomy
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
