. Construction and test of a rotary transformer for direct current . COHSTRUCTIOK AND TESTof aROTARY TRANSFORMERforDIRECT CURRENT 22759 The introduotion of Tantalum filament lamps in1906 gave a great impetus to the lamp industry. TheTantalum filament changes its physical structure dur-ing use, losing its smooth, uniform surface, and he-coming rough, off set, and brittle. This changetakes place more rapidly on alternating than on di-rect current circuits. Ahout two years later, thelighting industry received another advance in theshape of the Tungsten filament laoip. This lamp atJU£5 watts per c
. Construction and test of a rotary transformer for direct current . COHSTRUCTIOK AND TESTof aROTARY TRANSFORMERforDIRECT CURRENT 22759 The introduotion of Tantalum filament lamps in1906 gave a great impetus to the lamp industry. TheTantalum filament changes its physical structure dur-ing use, losing its smooth, uniform surface, and he-coming rough, off set, and brittle. This changetakes place more rapidly on alternating than on di-rect current circuits. Ahout two years later, thelighting industry received another advance in theshape of the Tungsten filament laoip. This lamp atJU£5 watts per candle power means a lamp over 200times as good as a standard carhon lamp, each withnormal life. Tungsten lamps of 6 to 20 voltshave short, thick filaments and are very long livedand satisfactory. The low, specific resistenoe ofthe Tungsten gives the filament a very deslrshledimensions, this advantage has caused a large in-crease in the use of low voltage lamps for many pur-poses, especially for residence lighting systems offrom 27 to 60 volts. The low voltage lam
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Keywords: ., bookcentury1900, bookdecade1910, bookidconstruction, bookyear1911
