Elementary treatise on physics experimental and applied for the use of colleges and schools (1890)
Ganot, A. (Adolphe), 1804-1887, Atkinson, E. (Edmund) · New York : W. Wood · leaf 822
ion. The movement, on a screen, of a spot of light reflected from a body, is themost delicate and convenient means of observing motions which of them-selves are too small for direct measurement or observation. Hence thisprinciple is frequently applied in experimental investigations and in… … It will be seen from the article on the Electric Telegraph, how alternatedeflections of the spot of light may be utilised in forming a code of signals. 823. Tang-ent compass, or tangent galvanometer.—When a magneticneedle is suspended in the centre of a voltaic current in the plane of themagnetic…
Physics
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