Signalling through space without wires : being a description of the work of Hertz & his successors . e Hertz wave method of signalling, hecan refer here to certain patents taken out, in conjunctionchiefly with Dr. Alexander Muirhead, his co-worker, which arenumbered respectively as follows :— (1) 11,575 of 1897, wherein is described the generalsyntonic principle and the mode of prolonging the duration e 2 52 SIGNALLING WITHOUT WIRES. of the vibrations emitted by a radiator or by a receiver. Thisis done by adding to it electromagnetic inertia (that is, a self-induction coil) in such a way as to
Signalling through space without wires : being a description of the work of Hertz & his successors . e Hertz wave method of signalling, hecan refer here to certain patents taken out, in conjunctionchiefly with Dr. Alexander Muirhead, his co-worker, which arenumbered respectively as follows :— (1) 11,575 of 1897, wherein is described the generalsyntonic principle and the mode of prolonging the duration e 2 52 SIGNALLING WITHOUT WIRES. of the vibrations emitted by a radiator or by a receiver. Thisis done by adding to it electromagnetic inertia (that is, a self-induction coil) in such a way as to lessen its radiating power,converting its type of emission from something like a whip-crack into something more like that of a struck string. (Notpushing it so far as to make it like a fork, though thatcould be done if desired: see Journal , December,1898.) But too prolonged a duration of vibration is notdesirable, for it can only be obtained at the expense ofradiating power. For the most distant signalling the singlepulse or whip-crack is the best, and this is what in practice :w ©. Fig. 25 (Fig. 13 of Specification 11,575/97). — Diagram of connections forSyntonic Receiver ; e being coherer and w a non-inductive conducting orcapacity shunt, to eliminate the self-induction of the receiving instru-ment. has hitherto always been employed; but, with it, tuning is ofcourse impossible. A radiator with several swings is lessviolent at its first impulse than is a momentaty emitter;but then the lessened emitting power of a ladiator is tobe compensated by a correspondingly prolonged duration ofvibration on the part of the receiver or absorber, thusrendering the radiator susceptible of tuning to a specialsimilarly-tuned receiver or resonator. The tuned resonatoris then to respond, not to the first impulse of the radiator, butto a rapidly worked up succession of properly timed impulses;so that at length, after an accumulation of two or three, or TELEGRAPHIC APPLICATIONS. 53
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