Peck, William G. (William Guy), 1820-1892 · New York, Chicago, A. S. Barnes & company · leaf 161
rays are allowed to fall upon the objective ofthe view-telescope, C, which differs in no material respectfrom an ordinary refracting telescope of low power. Thetelescope is attached to the frame of the instrument, and 156 ASTRONOMY. can be turned around an axis parallel to the edges of theprism ;… … Fig. 68. Perspective view of a simple Spectroscope. Explanation. B is the collimator; P is the refracting prism : and A is theview-telescope. C is a tube which carries at the end nearest the light F a fine scaleof equal parts photographed on glass ; the divisions of the scale, illuminated by…
Astronomy
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