Proceedings of the Institution of Electrical Engineers, Volume 38

3-phase air-gap alternating current amperes apparatus armature average brush cable candle power carbon lamp cent coil connection considerable constant copper copper losses cost current density curves diagram difficulty direct current direct-current effect efficiency Electrical Engineers experiments factor field filament lamps flux frequency give given glow lamps heating hysteresis increase induction insulation iron lamp makers leakage coefficient light load losses machine magnetic magnetising current maximum mean measurements metallic filament method motor converter motor-generator National Physical Laboratory Nernst lamp obtained ordinary osmium paper pentane pentane lamp photometer plant possible practically pressure ratio reactance reduced regard relay resistance rotary converter rotor shown shunt slot speed station steam supply surface switch taken tantalum tantalum lamp temperature rise tests track circuit transformer unit variation varying voltage volts watts per candle winding wire ΙΟ