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 559
graduated scale,which is generally placed immediatelyabove the aperture. Such a lamp and scale are illustrated in fig. 496. 533. Mances heliograph.—The reflection of light from mirrors has beenapplied by -Sir H. Mance in signalling at great distances by means of thesuns light. The ajjparatus… … Kig. 496 542 On Light [533- obseiver then can see through a telescope the reflection of the suns rays asa spot of light. The mirror has an adjustment by which it can be made tofollow the sun in its apparent motion. There is also a lever key by whichthe signaller, after directing the reflected beam…
Physics
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