Lessons in astronomy including uranography. A brief intoductory course without mathematics (1896)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston, London, Ginn and company · leaf 136
s to usea small view telescope, so called to distinguish it from thelarge telescope to which the spectroscope is often attached. 1 The grating is merely a piece of glass or speculum metal, ruled withmany thousand straight, equidistant lines, from 5000 to 20,000 in theinch. § 172] THE SPECTROSCOPE.… … F%k 1 1 — ■Ntr.1 1 f1 ^M^ Collimator
Astronomy
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