Snelling, Henry Hunt, 1816-1897 · [New York : W.B. Smith] · leaf 261
1. we float, one upon the other, fluids, &,<?,£?,having different powers of refraction, wea … 1853. The Photographic Art-Journal. 245 shall then see the relative phenomena ex-hibited by the bending of the ray a a, inpassing through them (Fig. 2). It willbe evident that no great difficulty exisfs inmeasuring the refractive powers of differenttransparent bodies : and that h mce we areenabled…
Photography · Art and photography
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