Signalling through space without wires : being a description of the work of Hertz & his successors . 2 h3 is un-necessary, though sometimes helpful. The main charging is done byimpulsive rush at the outside knobs. the receiver shall not be so near the emitter as to feel itsimpulses too easily, , without accumulation; (b) that theproperly-tuned receiver shall be so arranged that it can workup and accumulate the impulses of the radiator, and beforeattaining its maximum swing can overflow into the cohererassociated with it and thus give the signal. 54 SIGNALLING WITHOUT WIRES. The general app
Signalling through space without wires : being a description of the work of Hertz & his successors . 2 h3 is un-necessary, though sometimes helpful. The main charging is done byimpulsive rush at the outside knobs. the receiver shall not be so near the emitter as to feel itsimpulses too easily, , without accumulation; (b) that theproperly-tuned receiver shall be so arranged that it can workup and accumulate the impulses of the radiator, and beforeattaining its maximum swing can overflow into the cohererassociated with it and thus give the signal. 54 SIGNALLING WITHOUT WIRES. The general appearance of a pair of signalling stations onthis plan is shown in Fig. 24, where the huts contain thesending and receiving instruments. The self-induction coiljoining the two capacity-areas is better depicted in , which also shows one mode of joining up the cohererto a syntonic receiver. (The galvanometer and shunt are,of course, merely typical of any kind of telegraphic instru-ment whatever.) Fig. 26 indicates one form of senderwith three alternative syntonising coils for speaking to three. Fig. 28 (Fig. 7 of Specification 11,575/97).—Syntonic Radiator with earthconnection arranged for sending. distant attuned stations. Fig. 27 shows a radiator arrangedfor receiving, but illustrates another method of charging,and one frequently employed by the author, viz., the methodby impulsive rush (compare Figs. 11, 12 and 19, on pp. 14and 25 of this book). The terminals of the Ruhmkorff coilare here connected, not to the capacity areas direct, but to apair of knobs near the centre of gravity of each area, so thatwhen the discharge occurs each area is suddenly chargedoppositely, and the two opposite charges are left to surge intoone another and set up the oscillations. This impulsive TELEGRAPHIC APPLICATIONS. 55 method of charging is essentially that adopted in the sphericalwhip-crack emitter depicted in Fig. 19 (p. 25, ante), the two polesof the sphere having but small capacity and
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