Signalling through space without wires : being a description of the work of Hertz & his successors . 72 SIGNALLING WITHOUT WIRES. instrument or the relay, or the circuit as a whole, enabledthis excellent result to be attained with apparent ease. A diagram of Marconis connection of sensitive tube to therelay and tapper-back and Morse instrument, where W repre-sents the elevated wire, is given in Fig. Fig. 52 (Fig. 2, of p. 691, The Electrician, Vol. XLII.).—Diagram ofthe connection of Relay and Tapper-! ack and Morse Instrument, as givenin Mr. Marconis Paper in the Journal of the Inst. Ele
Signalling through space without wires : being a description of the work of Hertz & his successors . 72 SIGNALLING WITHOUT WIRES. instrument or the relay, or the circuit as a whole, enabledthis excellent result to be attained with apparent ease. A diagram of Marconis connection of sensitive tube to therelay and tapper-back and Morse instrument, where W repre-sents the elevated wire, is given in Fig. Fig. 52 (Fig. 2, of p. 691, The Electrician, Vol. XLII.).—Diagram ofthe connection of Relay and Tapper-! ack and Morse Instrument, as givenin Mr. Marconis Paper in the Journal of the Inst. Elec. Engineers forApril, 1899 ; the relay being an ordinary Siemens polarised relay. The mast at the South Foreland was stated to be , but the cliff on which it stands must be at a still greaterelevation above the sea. It was from this station that thereal distant signalling was performed, and probably not fromthe lower mast at Dover. COUEBEli HISTORY. 73 THE HISTORY OF THE COHERER PRINCIPLE. The following, written by Dr. Oliver Lodge, appeared in TheElecteician for November 12th, 1897 :— Probably the earliest discovery of cohesion under electricinfluence was contained in that old, forgotten observationof Guitard in 1850, that when dusty air was electrified froma point the dust particles tended to cohere into strings orflakes. The same thing no doubt occurs in the formation ofsnowflak
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