A dictionary of electrical words, terms and phrases (1898)
Houston, Edwin J. (Edwin James), 1847-1914 · New York, The W. J. Johnston company · leaf 326
Fig. 344. Piano-ConvexAchromatic Lens. Fig- S4S- AchromaticLens. convex surfaces ; the flint glass, with one con-cave and one plane surface, as shown in Fig. 344. Sometimes both surfaces of the flint glass aremade curved, as in Fig. 345. Lenzs Law.—(See Law, Lcnzs) Letter Box, Electric A device…
Electricity · Electrical engineering
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