. An elementary manual of radiotelegraphy and radiotelephony for students and operators . fieldmagnet with magnetic poles projecting inwards and a rotatingarmature in the form of a fly-wheel. This wheel, J (see Fig. 2),was turned down on the edge, forming a kind of flanged pulley,and this groove is wound full of annealed iron wire insulatedwith shellac. Pins, L, were set in the sides of the ring J, andflat coils, M, of insulated wire wound over the periphery ofthe armature wheel and around the pins. These coils wereconnected together in series, and the ends of the series carriedthrough a hollo
. An elementary manual of radiotelegraphy and radiotelephony for students and operators . fieldmagnet with magnetic poles projecting inwards and a rotatingarmature in the form of a fly-wheel. This wheel, J (see Fig. 2),was turned down on the edge, forming a kind of flanged pulley,and this groove is wound full of annealed iron wire insulatedwith shellac. Pins, L, were set in the sides of the ring J, andflat coils, M, of insulated wire wound over the periphery ofthe armature wheel and around the pins. These coils wereconnected together in series, and the ends of the series carriedthrough a hollow shaft, H, to slip rings, P, P, from whichthe currents were taken off by brushes, 0, 0. The fieldmagnet consisted of a kind of toothed wheel, with the teethturned inwards (see Fig. 2), and an insulated wire or strip waswound zigzag fashion between these teeth, so that when a con-tinuous current was passed along this conductor, the teeth were G RADIOTELECRAPHY made alternately North and South raagnetic poles. It is quitepossible thus to produce a magnet having 400 radial poles in the. Fig. 1. circumference and also easy to put 400 coils on the if such a machine is driven at a speed of 3000 revolutions D E
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1916
