Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 312
LED TYPECharacteristics and Efficiency. This lamp, Fig. 10, is the finalword, at the present time, in the improvement of filament types ofincandescent lamps and it is a recent improvement upon the tung- 278 ELECTRIC LIGHTING 15 sten lamp as ordinarily manufactured. One of the results of the… … T Fig. 10. Unmounted Nitrogen-Filled Lamp Showing Short Helical Filament nitrogen, at practically atmospheric pressure, and the filament thenrun at a very much higher temperature than had ordinarily been usedwith the vacuum type of lamp, the efficiency of the lamp could beimproved and the life of…
Electrical engineering
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