Signalling through space without wires : being a description of the work of Hertz & his successors . 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 co
Signalling through space without wires : being a description of the work of Hertz & his successors . 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 :— On using a sensitive relay in the circuit with the coherertube, and an ordinary electric bell in the other circuit of the. Fia. 41 (Fig. 7 of Specification 29,069/97).—Diagram of connections ata protected Coherer Station with Syntonic Radiator and Collector. relay, for sound signals and as an automatic tapper for thecoherer, I obtain an apparatus which exactly answers everyelectric wave by a short ring, and by rhythmical strokes ifelectric vibrations be excited continuously. On connecting an electro-magnetic recorder in parallelwith the bell, tracing a straight line along the paper bandwhich is moved by a 12-hour clockwork cylinder, I obtain aninstrument registering by a cross line on the moving band 62 SIGNALLING WITHOUT WIRES. every electric wave that reaches the coherer from across theatmosphere. Such an apparatus was placed at the Meteoro-logical Observatory at St. Petersburg in July, 1895, one ofthe electrodes of the coherer being connected by an insulatedwire with an ordinary lightning conductor, t
Size: 1669px × 1497px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookidsi, booksubjectelectricity
