Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 78
is in air, water, or oil, and that that being so,the 180° admitted by the dry objective must represent a maximumquantity of light, a whole which cannot be exceeded, but onlyequalled, by a water- or oil-immersion objective. The numericalaperture notation giving figures in excess of 10 (which… … Fig. 36.—Diagram of a brightspherical object emittinglight. 54 VISION WITH THE COMPOUND MICROSCOPE In 1864 R. Clausius established, by distinguished research, the propo-sition 1 that the power of emission of a body—in regard to heat as wellas light—is not the same in different media, but varies in…
Microscopy
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-325-217.webp)
