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 39
Newton was to place a small plane mirror just insidethe focus, inclined to the telescope at an angle of 45 °, soas to throw the rays to the side of the tube, where theycome to a focus, and form the image. An opening is madein the side of the tube, just below where the image isformed ; and in this… … 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…
Astronomy
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