Signalling through space without wires : being a description of the work of Hertz & his successors . ome coherer is protected. A rotating commutator L ~s Fig. 39 (Fig. 3 of Specification 29,069/97).—Diagram of Coherer con-nection to Syntonic Collector, with capacity shunt for telegraphicinstrument. is also shown, whose object is to expose the coherer to thefull influence of a receiver, especially of a non-syntonicreceiver or simple collector, without its being shunted orotherwise interfered with by the telegraphic apparatus ;to which, however, immediately afterwards the rotatingcommutator conn
Signalling through space without wires : being a description of the work of Hertz & his successors . ome coherer is protected. A rotating commutator L ~s Fig. 39 (Fig. 3 of Specification 29,069/97).—Diagram of Coherer con-nection to Syntonic Collector, with capacity shunt for telegraphicinstrument. is also shown, whose object is to expose the coherer to thefull influence of a receiver, especially of a non-syntonicreceiver or simple collector, without its being shunted orotherwise interfered with by the telegraphic apparatus ;to which, however, immediately afterwards the rotatingcommutator connects it, and then effects the tapping-back. 60 SIGNALLING WITHOUT WIRES. Connections are shown (Fig. 41) for a complete sending andreceiving station on this plan with a syntonic radiator andresonator indicated (though not to scale). But with syntonicresonators the revolving commutator method is not found tobe necessary; the sending and receiving switch, togetherwith the closed box for protecting the coherer in an instantlyaccessible manner is therefore the chief feature of thisdiagram. .m „n. Fig. 40 (Fig. 6 oi Specihcaiiun Z9,uby/b»/j.—(switch au a lending andReceiving Station, to change all the connections with a protected Cohererfrom receiving to sending by depressing the knob I. Earlier Telegraphic April, 1895, a communication was made to the RussianPhysical Society by Prof. A. Popoff, of the Torpedo School,Cronstadt, Russia, and appears in the Journal of that Societyfor January, 1896. In this communication the use of anelevated wire and of a tapper-back worked through a relay bythe coherer current are clearly described, and signalling waseffected for a distance of 5 kilometres (3 J miles). TELEGRAPHIC APPLICATIONS. 61 An extract from this communication is given in TheElectrician for December, 1897, Vol. XL., page 235, and fromit we reproduce Fig. 42, illustrating the tapping backarrangement. The following extracts from this paper may also bequoted :— O
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