Snelling, Henry Hunt, 1816-1897 · [New York : W.B. Smith] · leaf 261
is to allow a sunbeam o, passingthrough, a small hole in the window-shutter of a dark room, to fall upon the surface ofa fluid contained in a glass vessel, b b :instead of proceeding onwa?ds to a. it willbe found to alt^r its course at the surfaceof the fluid, and pass along the line to a a.Every… … 1. we float, one upon the other, fluids, &,<?,£?,having different powers of refraction, wea
Photography · Art and photography
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