Maxwell's theory and wireless telegraphy by Vreeland Frederick K

Author:Vreeland, Frederick K[ing], 1874- [from old catalog] & Poincaré, Henri, 1854-1912
Language: eng
Format: epub
Tags: Telegraph, Wireless, Electric waves
Publisher: New York, McGraw publishing company
Published: 1904-03-25T05:00:00+00:00

Fig. 67.—Marconi's coherer — longitudinal section. T is the glass tube, with leading-in wires terminating in the silver electrodes, E, E'. In the ppace between these are the filings.

bore, in which were fitted two silver plugs attached to terminal wires. The plugs were about one mm. apart, and the space between them contained a mixture of specially-prepared silver and nickel filings. The whole tube was then exhausted and hermetically sealed.

In its normal condition this apparatus has an extremely high resistance, but under the influence of electrical oscillations its resistance drops immediately to between 100 and 500 ohms. When this occurs a local circuit is completed through a battery and a sensitive relay, which in turn operates the recording apparatus and sets in motion

WIRELESS TELEGRAPHY.

an automatic tapper, which strikes the tube of the coherer and restores it to its original condition of high resistance.

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