Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 352
ing-point, as it ischeaper to replace the lamp than to run it at the reduced candle-power. Some recommend running these lamps at a highervoltage, but that means at a reduced efficiency, and it is not goodpractice to do this. 293 12 ELECTRIC LIGHTING Fig. G shows the life curves of a series of… … Fig. 7. the light given \>y the lamp is gradually reduced to about 80% otthe initial candle-power. DISTRIBUTION OF LIGHT. In Fig. 1 are shown various forms of filaments used inincandescent l.imj)s, and Figs. 7 and 8 show the distribution oflight from a single-loop filament of cylindrical…
Architecture · Building · Carpentry
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