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 40
ASTRONOMY. 23 inclined mirror is replaced by a small rectangular prism(Fig. 25), by reflection from which the image is formedvery near the prism. A pair of lenses are then inserted inthe course of the rays, by which a second image is formedat the opening in the side of the tube ; and this… … Fig. 25. James Gregory, who probably preceded Newton as an in-ventor of the reflecting telescope. Behind the focus, F(Fig. 26), a small concave mirror, R, is placed, by whichthe light is reflected back again down the tube. The largermirror, M, has an opening through its centre ; and the…
Astronomy
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