Brewster, David, Sir, 1781-1868, Bache, A. D. (Alexander Dallas), 1806-1867 · Philadelphia : Lea and Blanchard · leaf 277
prismatic rod were cut out of a plate of thick par-allel glass. The separate prisms being1 cemented to one an-other, as in the figure, will form a compound prism, whichwill be superior to the common prism for all purposes in whichit acts solely by refraction. (188.) A compound prism of a different… … one of the lenses round upon the other, the inclination of thefaces A B, D E, or A B, C E, may be made to vary from 0° toabove 90°. (189.) .As this apparatus is both troublesome Lo execute anddifficult to use, I have employed an entirely different principlefor the construction of a variable prism,…
Optics
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