Brewster, David, Sir, 1781-1868, Bache, A. D. (Alexander Dallas), 1806-1867 · Philadelphia : Lea and Blanchard · leaf 69
een, M N, we should expect, from the principlesalready laid down, that the white beam which previously fellupon I would suffer only a change in its direction, and fallsomewhere upon M N, forming then- a round white spot ex-actly similar to that at P. But this is not the case. Insteadof a white… … beam of light diverging from its emergence out of the prismat g, and being bounded by the lines g K, g L. This length-ened image of the sun is called the solar spectrum, or theprismatic spectrum. If the aperture H is small, and the distance g G considerable, the colors of the spectrum will be…
Optics
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![An illustration from Essai de physique, par Mr. Pierre van Musschenbroek ... avec une description de nouvelles sortes de machines pneumatiques, et un recueil d'expériences par Mr. J. v[an] M[usschenbroek] Traduit du hollandois par Mr. Pierre Massuet .. (1751)](https://img.insideoutlibrary.com/img/200/ia-essaidephysiquep02muss-131-37.webp)
