Elementary treatise on physics, experimental and applied : for the use of colleges and schools (1906)
Ganot, A. (Adolphe), 1804-1887, Atkinson, Edmund, 1831-1901, Reinold, A. W. (Arnold William), 1843-1921 · New York : Wood · leaf 553
re of a graduated circle, M (fig. 487),placed in a vertical position, there is a small telescope movable in a planeparallel to the limb ; at a suitable distance there is a vessel D full of mercury,which forms a perfectly horizontal plane mirror. Some particular star ofthe first or second magnitude… … In this way the two angles formed by the rays EA and DA, with the hori-zontal AH, are found to be equal, from which it may easily be shown thatthe angle of incidence EDE is equal to the angle of reflection EDA. Forif DE is the normal to the surface of the mercury, it is perpendicular to AH,and AED,…
Physics
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