Signalling through space without wires : being a description of the work of Hertz & his successors . ped asunder; but if the bell stands on the sametable as the knobs, especially if it rests one foot on the actualstand, then its first stroke taps them back instantly and auto-matically, and so every discharge of the sending jar is * Journal Institution of Electrical Engineers, 1890, Vol. XIX., ; or Lightning Conductors and Lightning Guards, pp. 382-4. 22 SIGNALLING WITHOUT WIRES. signalled by a single stroke of the bell. Here we have inessence a system of very distinctly syntonic teleg
Signalling through space without wires : being a description of the work of Hertz & his successors . ped asunder; but if the bell stands on the sametable as the knobs, especially if it rests one foot on the actualstand, then its first stroke taps them back instantly and auto-matically, and so every discharge of the sending jar is * Journal Institution of Electrical Engineers, 1890, Vol. XIX., ; or Lightning Conductors and Lightning Guards, pp. 382-4. 22 SIGNALLING WITHOUT WIRES. signalled by a single stroke of the bell. Here we have inessence a system of very distinctly syntonic telegraphy, forthe jars and their circuits must be accurately tuned together,if there is to be any response. A very little error in tuning,easily made by altering the position of the slider (Fig. 4),will make them quite unresponsive, unless the distancebetween them is reduced. At the maximum distance of response the tuning requiredis excessively sharp. But, certainly, for these closed anddurably-vibrating circuits, the distance of response is small,as has been said before. Fig. 16a shows the syntonic.
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