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
he light from the other source is sent through the covered portion of the slit by reflection from the surface of the rectangular prism. Fis- l68- This arrangement and its action will be readily understood from Fig. 167. 151. Direct-Vision Spectroscope, — A beam of light maybe dispersed, without any…
Astronomy
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