Text-book of general physics, for the use of colleges and scientific schools (1899)
Hastings, Charles Sheldon · Boston: Ginn & company · leaf 650
ded to assist theobserver in viewing a distant object. SEX TAXT. 639 Suppose that light is falling on theinstrument from twodistant points in the directions HC and SB respectively.Then, by turning the arm F through a proper angle, it ispossible to arrange the mirrors so that one-half of the… … Fig. 436. Fig. 437. the image of one object is thus brought into coincidence witha second, the angle through which the mirror has been turnedis one-half the angular separation of the objects as seen by theobserver. Let 0, 0 (Fig. 437) be the two mirrors, and athe angle between them. Also, let SO be…
Physics
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-335-226.webp)
