Gage, Alfred P. (Alfred Payson), 1836-1903, Fessenden, C · Toronto : W.J. Gage · leaf 390
t AB. § 315. Astronomical telescope.. — The astronomical re-fracting telescope consists essentially, like the compound micro-scope, of two lenses. The object-glass (O, Fig. 295) forms areal diminished image ah of the object AB; this image, seenthrough the eye-glass E, appears magnified and of the… … best telescopes may be obtained from the fact that Mr. Clarkof Cambridgeport has made a telescope of such magnifjingpower, and possessing such distinctness of definition, that a balltwo inches in diameter, and two hundred and fifty miles distant(about the distance between Boston and New York),…
Physics
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