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
F%k 1 1 — ■Ntr.1 1 f1 ^M^ Collimator … Grating-SpectroscopeCollimator ,S2 Grating Direct-Vision SpectroscopeFig. 32. — Different Forms of Spectroscope. telescope, — although in the direct-vision spectroscope,shown in the figure, the view telescope is omitted. If the slitS be illuminated by strictly homogeneous light (i.e., light allof…
Astronomy
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