Young, Charles A. (Charles Augustus), 1834-1908, Young, Anne Sewell, b. 1871., ed · Boston, New York [etc.] Ginn and Company · leaf 135
Fig. 44. — Telescope and Screen. … Fig. 45.— Herschel Eye-Piece. wider its image of a sharp line. fore, to sacrifice the definition of delicate details. The simplest, and a very good one,is known as Herschels, in which thesuns rays are reflected at right anglesby a plane of unsilvered glass (Fig.45). With this apparatus, althoughthe…
Astronomy · Constellations
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