Brewster, David, Sir, 1781-1868, Bache, A. D. (Alexander Dallas), 1806-1867 · Philadelphia : Lea and Blanchard · leaf 290
s double lenses shown in figs. 4!i and44., which are entirely free from spherical aberration. One ofthese, fig. 44., has been executed ! of an inch focus, with anaperture of —. of an inch; and Mr. Pritchard, to whom it be-longs, informs us that it brings out all the test objects, and ex-hibits… … * See Edinburgh Journal of Science, No. VIII. new series, p. 244. ■ $m w$w?^, s^ fMmw 286 A TREATISE ON OPTICS. PART IV. giving its minute parts their proper position and appearance.In order to render this method perfect, it is proper to immersethe anterior surface of the object glass in the same…
Optics
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