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 171
eased absorption is due tothe fact, that the rays which reach us from near the marginhave to traverse a much greater thickness of the solaratmosphere than those which reach us from the centre ofthe disk. This will be evident from Fig. 162, in which thearrows mark the paths of rays from different… … Fig. 163. of the sun and of the other heavenly bodies. It hasbecome almost as indispensable to the astronomer as thetelescope. 148. The Dispersion Spectroscope.—The essential partsof the dispersion spectroscope are shown in Fig. 163.These are the collimator tube, the prism, and the telescope.The…
Astronomy
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