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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
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Bulletin. A. LAMPS IN TIP-BREAKING TEST, SHOWING FILAMENTS DISTORTED AND BROKEN BY THE ENTERING GAS.. B. LAMPS IN TIP-BREAKING TEST, SHOWING FILAMENTS THAT BURNED OFF AFTER IGNITING THE GAS. DETAILS OF