Elementary treatise on electricity and magnetism : (1905)
Foster, G. C. (George Carey), 1835-1919, Joubert, J. (Jules François), 1834-1910, Porter, Alfred W. (Alfred William), 1863-1939 · London ; New York ; Bombay : Longmans, Green, and Co. · leaf 538
layer of carbon ; at a greater pressure, 2 or 3 millimetres, for example, the bulb becomes heated. The illuminating power i rapidly increases with the strength of the current; but the life of the lamp is thereby shortened. 1 The Eriarlish official standard of illuminatiDg power is a… … Fig. 349. 443] INCANDESCENT LAMPS 517 The conditions of maximum economy are those in whichthe gain in luminosity and the loss in the life of the lamp,each estimated by its money value, exactly compensate eachother. Equilibrium of temperature is attained when the rate at whichheat is lost by…
Electricity · Magnetism
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