A dictionary of electrical words, terms and phrases (1896)
Houston, Edwin J. (Edwin James), 1847-1914 · New York, The W.J. Johnston company · leaf 328
Fig. 344. Piano-ConvexAchroviatic Lens. Fig- 345 AchromaticLens. convex surfaces ; the flint glass, with one con-cave and one plane surface, as shown m Fig. 344- Sometimes both surfaces of the flint glass aremade curved, as in Fig. 345. Lenzs Law.—(See Law, Lenss.) Letter Box, Electric A device…
Electricity · Electrical engineering
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