A text book of physics, for the use of students of science and engineering (1918)
Duncan, John, d. 1941, Starling, Sydney George, 1873- · London Macmillan · leaf 584
D---^- FiG. 507.—The sextant. To find the elevation of a star, or the sun, the arm carrying themirror B is rotated into the position shown in Fig. 507 (b).. so thatthe rays FB, from the object, pass after reflection at B, along the pathBAC, and the observer sees the star, or more usually, the lower…
Physics
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