The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 44
inferior to theNewtonian ; but the latter is subject to the inconvenience,that the observer must be stationed at the upper end ofthe telescope, where he looks into an eye-piece screwedinto tlie side of the tube. ASTRONOMY. 25 On the other hand, the Cassegrainian Telescope is pointeddirectly at the… … Fig. 28. The largest reflecting telescope yet constructed is that ofLord Rosse, at Parsonstown, Ireland. Its speculum is 6 feetin diameter, and its focal length 55 feet. It is commonly usedas a Newtonian. This telescope is shown in Fig. 27. The great telescope of the Melbourne Observatory,…
Astronomy
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
