. The Ontario high school physics. has an internal diameter of about ^inch. The plugs P, P snugly slidein the tube, and a small amount of filings is placed between them. Marconi has used a mixtureof 95 per cent, nickel and 5 per cent, silver. 571.—A form of coherer intro-duced by Marconi. Fig. 572.—Simple form of apparatus to illustrate wirelessteleffraphy. The transmitter is on the left, the receiveron the right. 575. Wireless Telegraphy. By meansof electric waves it is possible to sendsignals from one place to another withoutconnecting wires. A simple arrangementfor doing this is shown in Fi
. The Ontario high school physics. has an internal diameter of about ^inch. The plugs P, P snugly slidein the tube, and a small amount of filings is placed between them. Marconi has used a mixtureof 95 per cent, nickel and 5 per cent, silver. 571.—A form of coherer intro-duced by Marconi. Fig. 572.—Simple form of apparatus to illustrate wirelessteleffraphy. The transmitter is on the left, the receiveron the right. 575. Wireless Telegraphy. By meansof electric waves it is possible to sendsignals from one place to another withoutconnecting wires. A simple arrangementfor doing this is shown in Fig. 572. C isan induction coil, n, nbeing knobs on the endsof its secondary. A wireA runs np in the air fromone knob while the otheris joined to earth. 7) is abattery and K a key inseries with the primary ofthe coil. On depressing KW^ sparks pass between -)?, -7?and violent surg;ini{s ofelectricity up and down A are produced. Thesedisturbances in tlie surroilnding ether, the energy ofis carried by ether-waves in all
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishe, booksubjectphysics
