Astronomy for the use of schools and academies (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908, Rolfe, W. J. (William James), 1827-1910 · New York : Potter, Ainsworth, & Co. · leaf 176
Fig. 171- e the comparison prism at the end of the collimator tube.A more powerful instrument is shown in Fig. 172. A isthe telescope, C the collimator tube of the spectroscope, ASTRONOMY. iS7 P the train of prisms, and E the telescope tube. Fig. 173shows a still more powerful spectroscope attached… … Fig. 172. 153. The Diffraction Spectroscope. — A diffraction spec-troscope is one in which the spectrum is produced bv
Astronomy
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