. The Bell System technical journal . DIAPHRAGM AIR GAPS-. POLE PIECES- -POLARIZING-MAGNETS Fig. 6—Magnetic circuit of the new telephone receiver. tivity required, so that no general statement can be made as to needsin this field. The problems encountered are essentially similar tothose met in the receiver and ringer, for which numerous materials areavailable. 454 BELL SYSTEM TECHNICAL JOURNAL 3. Force on Current {Moving Coil Receivers, Light Valves, Motors)A straight wire of length / carrying a current i in a perpendicular magnetic field of flux density B is pushed at right angles to the fiel
. The Bell System technical journal . DIAPHRAGM AIR GAPS-. POLE PIECES- -POLARIZING-MAGNETS Fig. 6—Magnetic circuit of the new telephone receiver. tivity required, so that no general statement can be made as to needsin this field. The problems encountered are essentially similar tothose met in the receiver and ringer, for which numerous materials areavailable. 454 BELL SYSTEM TECHNICAL JOURNAL 3. Force on Current {Moving Coil Receivers, Light Valves, Motors)A straight wire of length / carrying a current i in a perpendicular magnetic field of flux density B is pushed at right angles to the field and the length with a force F = Bil = txHil, where m is the permeability and H is the magnetizing force in thenearby material from which the flux is derived. Again, the primerequirement for a useful material is high flux capacity, and highpermeability, so that the magnetizing force need not be large. Themagnetizing force has been supplied generall^^in the past by meansof direct current in windings built into th^ apparatus. With thenormally available
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
