Cyclopedia of architecture, carpentry, and building : a general reference work (1912)
American Technical Society · Chicago : American Technical Society · leaf 139
temperature eiK-flieient —rise in resistanct- with rise in temperatun—a thsirahle f«ature fromllii i.iiidpuiiii of Vdltap- r<;,ndali(>n of the circuit from \\lii(h thelanip^ are npcralcd. The lii^li temperature also resull.s in the drivingoff of con^id^•^al<le of the material which, in the… … for the decrease in candle-power of the incandescent lamp. Themetallized filament lamp is operated at an efficiency of 2 5 watts peicandle with a useful life of about 500 hours. The change in candle-power with change in voltage is less than in the ordinary lamp onaccount of the positive temperature…
Architecture · Building
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