A dictionary of electrical words, terms and phrases (1898)
Houston, Edwin J. (Edwin James), 1847-1914 · New York, The W. J. Johnston company · leaf 173
re has a focal length ofone metre. One of two dioptres has a focallength of 50 centimetres; one of four dioptres25 centimetres. This is also spelled dioptry. Dioptric.—Relating to dioptrics.Dioptrics.—The science which treats ofthe refraction of light. Dioptry.—A word sometimes used for di-optre.… … 202. Angle 0/ Dip. supported at its centre of gravity, will not retaina horizontal position in all places on the earthssurface. In the northern hemisphere its north-seekingend will dip or incline at an angle B O C, calledthe angle of dip. In the southern hemisphereits south seeking end will dip.…
Electricity · Electrical engineering
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