. Practical wireless telegraphy; a complete text book for students of radio communication . il the circuit of P is opened by the key; thegalvanometer now gives a second momentary deflection but the needle moves in the oppositedirection just as in the case of the bar magnet. Thus for each make and break of thefirst circuit, two pulses of current flow through the winding S, the first in one directionaround the circuit, and the second in the op-posite direction. This current is said to beinduced in S by electromagnetic induction. 29. Mutual Induction.—It is of great importance to note that the ef
. Practical wireless telegraphy; a complete text book for students of radio communication . il the circuit of P is opened by the key; thegalvanometer now gives a second momentary deflection but the needle moves in the oppositedirection just as in the case of the bar magnet. Thus for each make and break of thefirst circuit, two pulses of current flow through the winding S, the first in one directionaround the circuit, and the second in the op-posite direction. This current is said to beinduced in S by electromagnetic induction. 29. Mutual Induction.—It is of great importance to note that the effect inS takes place only when the circuit of Pis made and broken. When current isflowing in P continuously, the magneticlines of force are stationary, and conse-quently current is not induced in S. Butwhen the lines of force about S rise andfall, then there will be a movement of cur-rent through S. If the .winding S is placedat a right angle to P instead of lying paral-lel to it, a change of flux in P will havelittle or no effect upon S. Fig. 15—^Magnetic Field of Solenoid 20 PRACTICAL WIRELESS TELEGRAPHY.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
