The geography of the heavens and classbook of astronomy; (1863)
Burritt, Elijah H. (Elijah Hinsdale), 1794-1838, Mattison, Hiram, 1811-1868, Whitall, Henry, 1819-1887? Celestial planisphere. [from old catalog] · New York, Mason brothers; Boston, Mason & Hamlin; [etc., etc.] · leaf 301
dging of the posi-tion of the immersed portion of the oarfrom the direction of the rays D B,locates the blade of the oar at C; thusreversing the effect illustrated at638. 641. The refracting power of different transparent substancesdepends mainly upon their density. Water refracts more thanair,… … effect of refractiox 642. By the aid of refraction,we may see objects that areactually behind an opaque orintransparent body. Here the piece of money at A, at thebottom of the cup, would be invisible tothe beholder at B, if the cup was empty,as the light from the money would passfrom A to C; but…
Constellations · Stars
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