. Practical wireless telegraphy; a complete text book for students of radio communication . rent Flowing Towards Reader. ■■■ ^ Strengtn 01 the magnetic field about a solenoid can be varied byfluxes of opposite directions as shown in Fig. 18. The solenoid windingsA and B are wound in opposite directions connected in series and finallyto the terminals of the battery. Since current flows through the two coils inopposite directions their magnetic fields are repellent and if the coils aretelescoped together (one within the other) the magnetic field will be nearlydestroyed. If the two coils are part
. Practical wireless telegraphy; a complete text book for students of radio communication . rent Flowing Towards Reader. ■■■ ^ Strengtn 01 the magnetic field about a solenoid can be varied byfluxes of opposite directions as shown in Fig. 18. The solenoid windingsA and B are wound in opposite directions connected in series and finallyto the terminals of the battery. Since current flows through the two coils inopposite directions their magnetic fields are repellent and if the coils aretelescoped together (one within the other) the magnetic field will be nearlydestroyed. If the two coils are partially telescoped, the resultant magnetic fieldvaries accordingly. Advantage istaken of this principle in construct-ing an instrument known as thevariometer, which is particularlyuseful for tuning wireless telegraphcircuits. The electromagnet in some form isemployed in nearly all electrical ma-chinery, and, therefore, the laws _,. o-nvprnino- macrnptiV fiplHs slnniilrl ^^ 3—Lines of Force About Two Conductors Carryinggoverning magnetic neias SnOUia Current in Opposite
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
