The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 45
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,… … reflector. Its mirror of silvered glass is 4 feet in diameter,and its focal length is 23 feet. This telescope is shown inFig. 29. 21. The Suns Motion among the Stars. — If we notice ASTRONOMY. 27 the stars at the same hour night after night, we shall findthat the constellations are steadily…
Astronomy
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