The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 176
Fig. 172. 153. The Diffraction Spectroscope. — A diffraction ^.■^tc-troscope is one in which the spectrum is produced by … Fig. 173. reflection of the light from a finely ruled surface, or grating,as it is called, instead of by dispersion in passing through a 158 ASTRONOMY. prism. The essential parts of this instrument are shownin Fig 174. This spectroscope may be attached to thetelescope in the same manner as the…
Astronomy
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