Signalling through space without wires : being a description of the work of Hertz & his successors . Fia. 17.—Early Form of Coherer, consisting of a spiral of thin iron wiremounted on an adjustable spindle and an aluminium plate. When thelever is moved clockwise the tip of the iron wire presses gently against thealuminium plate, whose end is bent at right angles and passed throughinto the hollow circular wooden box, of which the upper figure shows thetop and general appearance, and the lower figure shows the inside, Leyden jar experiment arranged with the double knobcoherer, instead of with th
Signalling through space without wires : being a description of the work of Hertz & his successors . Fia. 17.—Early Form of Coherer, consisting of a spiral of thin iron wiremounted on an adjustable spindle and an aluminium plate. When thelever is moved clockwise the tip of the iron wire presses gently against thealuminium plate, whose end is bent at right angles and passed throughinto the hollow circular wooden box, of which the upper figure shows thetop and general appearance, and the lower figure shows the inside, Leyden jar experiment arranged with the double knobcoherer, instead of with the spark gap of Fig. 4. Coherer in open, responding to Feeble Stimuli :—Small Sphere,Gas-lighter, Distant Sphere, Electrophorus. Well, this arrangement, which I call a coherer, is the mostastonishingly sensitive detector of Hertz waves. It differsfrom an actual air-gap in that the insulating film is not WORK OF HERTZ LECTURE. 23 really insulating; the film breaks down not only much moreeasily, but also in a less discontinuous and more permanentmanner, than an air-gap. Branlys tube of filings,
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Keywords: ., bookcentury1900, bookdecade1900, bookidsi, booksubjectelectricity
