The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 34
ing of the circle. If there is notan exact coincidence of the zero line with any division ofthe circle, we run the eye along the vernier, and note whichof its divisions does coincide with a division of the circle.The reading of the circle will then be the number of thefirst division on the circle… … i6 ASTRONOMY.
Astronomy
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