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 174
Fig. i6q. One of three prisms is shown in Fig. 168, and one of fiveprisms in Fig. 169. A direct-vision spectroscope (Fig. 170) is one in whicha direct-vision combination of prisms is employed. C isthe collimator tube, P the train of prisms, F the telescope,and r the comparison prism. 152. The…
Astronomy
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