Brewster, David, Sir, 1781-1868, Bache, A. D. (Alexander Dallas), 1806-1867 · Philadelphia : Lea and Blanchard · leaf 287
CHAP. XLI. COMPOUN U MICROSCOPES. 283 a cement of the same refractive power as the lenses, or, whatis far better, by taking a sphere of glass and grinding- awaythe equatorial parts, so as to limit the central aperture, asshown in fig. 159.; a construction which, when executed ingarnet, and used in…
Optics
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