The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 175
Fig, 170. object-glass of the telescope falls upon the slit at the endof the coUimator tube. A telespectroscope of small dis-persive power is shown in Fig. 171; a being the object-glass of the telescope, cc the tube of the telescope, and … 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…
Astronomy
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