id author title date pages extension mime words sentences flesch summary cache txt 16767 Proctor, Richard A. (Richard Anthony) Half-hours with the Telescope Being a Popular Guide to the Use of the Telescope as a Means of Amusement and Instruction. .txt text/plain 33645 1795 72 he turns his telescope towards a difficult double star. observer to direct a telescope of moderate power to the examination of way that a simple object-glass forms a telescope, a circumstance we of view of a Galilean Telescope depend on the size of the object-glass, _positive_ eye-piece, because the real image formed by the object-glass For observing objects at great elevations the diagonal eye-tube is view, if the telescope, once directed to the star, be made to revolve applied to the observation of close double or multiple stars, but for neighbouring stream of the Milky Way. Let our observer now direct his telescope to the star [epsilon] Lyræ. ring; and in Lord Rosse's great Telescope "wisps of stars" are seen towards E.S.E. It is seen as a double star with very moderate telescopic [alpha]^1 of the 4th magnitude; in a good telescope five stars are seen, ./cache/16767.txt ./txt/16767.txt