The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 172
Fig. 165. telescope beside that of the spectrum. One of the simplest of these methods is shown inFig. 166. A is the telescope, B the collimator, and C the IS4 ASTRONOMY. micrometer tube. The opening at the outer end of C con-tains a piece of glass which has a micrometer scale markedupon it. The…
Astronomy
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