Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
lar distances of theheavenly bodies, and depends on reflection from two mirrors. The mirrors, A and L, are so mounted that their angle of inclina-tion can be A-aried. The mirror, A, is attached to the movable armAF, by which its inclination is changed by moving the arm along thegraduated arc. The… … The mirror, A, is turned, by the arm AF, until the rays of any object,as the sun, moon, or a star, are twice reflected, and so directed to theeye; when they will coincide Avith the rays of the horizon or otherobject, H, seen by direct vision, and from which the angular distanceof the star is to be…
Physics · Astronomy
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