A course of experiments in physical measurement (1897)
Whiting, Harold, d. 1895 · Boston, D.C. Heath and Co. · leaf 275
MENT XLIV. THE SEXTANT. ^ 120. Principle of the Sextant. — A sextant maybe constructed, as in Fig. 105, of two pieces of look-ing-glass, ag and aj, hinged together at a with their reflecting surfaces in-ward. The silvering isremoved near e and neari, so that an object inthe direction x may beseen… … 1120.] THEORY OF THE SEXTANT. 245 direction ie. The angle, a, between the mirrors maybe measured by a graduated arc, yz. Let us first find the relation between the angle dthrough which the ray y is beilt and the angle abetween the mirrors. The law of the reflection oflight (§97) gives us the angles…
Physics
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