Elementary treatise on physics, experimental and applied : for the use of colleges and schools (1906)
Ganot, A. (Adolphe), 1804-1887, Atkinson, Edmund, 1831-1901, Reinold, A. W. (Arnold William), 1843-1921 · New York : Wood · leaf 638
es, andthe image is thereforebrighter. The magnifying power is the quotient of the focal length of themirror by the focal length of the eyepiece. Herschels great telescope was constructed in 1789; it was 40 feet inlength, the great mirror was 50 inches in diameter. The quantity of lightobtained by… … Fig. 603 -614] Camera Obscura 621 late Earl of Rosse. This magnificent instrument has a focal length of53 feet, the diameter of the speculum being 6 feet. It is at present usedas a Newtonian telescope, but it can also be arranged as a front-viewtelescope. 613. Notable telescopes.—The largest…
Physics
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