Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . rstemrequires a transmitter and a receiver. The transmitter is gen- 332 PRACTICAL ELECTRICITY. erally an induction coil capable of giving from a 3 to a 6-inchspark between brass spherical terminals, the spark gap beingregulated to obtain the best results for any given terminal of the secondary is also connected to a verticalwire or mast, which assists in the propagation of thewaves while the other terminal is grounded, Fig. 302. Atelegraph key, Fig. 298, is introduced
Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . rstemrequires a transmitter and a receiver. The transmitter is gen- 332 PRACTICAL ELECTRICITY. erally an induction coil capable of giving from a 3 to a 6-inchspark between brass spherical terminals, the spark gap beingregulated to obtain the best results for any given terminal of the secondary is also connected to a verticalwire or mast, which assists in the propagation of thewaves while the other terminal is grounded, Fig. 302. Atelegraph key, Fig. 298, is introduced into the primary circuitof the induction coil, whereby the dot and dashsystem of signals may be used. Details of the receiving appa-ratus are shown in Fig 302. A small glass tube (say £ inchinside diameter) contains two plugs of silver, separated fromeach other by a small gap (about .04 inch), which space ispartially filled with a mixture of silver and nickel filings, andforms what is called the coherer. The plugs are connected in.
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyo, bookyear1901
