The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 176
e the comparison prism at the end of the collimator tube.A more powerlul instrument is shown in Fig. 172. A isthe telescope, C the collimator tube of the spectroscope, ASTRONOMY. 157 P the train of prisms, and E the telescope tube. Fig. 173shows a still more powerful spectroscope attached to… … Fig. 172. 153. The Diffraction Spectroscope. — A diffraction ^.■^tc-troscope is one in which the spectrum is produced by
Astronomy
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