Cohere(Ag-Ni)

Forfatter/Opretter:

The original uploader was ENG0000 at japansk Wikipedia.

Kredit:

Transferred from ja.wikipedia to Commons.

Shortlink:

https://dkwiki.dk/b/3a262

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Wikimedia Commons

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beskrivelse:

A Branly coherer, 1902, an early primitive radio wave detector invented by Edouard Branly in 1890 and used in the first radio receivers until about 1906. This version, developed by Guglielmo Marconi, consists of an evacuated glass tube with metal filings between two metal electrodes. Radio waves from the antenna, applied across the electrodes, cause the filings to cohere, reducing the resistance of the device. This turns on a DC circuit attached to the electrodes, powered by a battery, that makes a "click" sound in earphones or a mark on a paper tape, to record the Morse code signal. The slanted faces of the electrodes allowed the gap between them, and thus the sensitivity of the detector, to be adjusted by rotating the tube.

Licens:

Public domain

Kommentar på licensen:

Public domainPublic domainfalsefalse

Dette værk er blevet udgivet som offentlig ejendom af dets skaber, 平川研究所. Dette gælder i hele verden. I nogle lande er dette ikke juridisk muligt. I så fald: 平川研究所 giver enhver ret til at anvende dette værk til ethvert formål, uden nogen restriktioner, medmindre sådanne restriktioner er påkrævede ved lov. Public domainPublic domainfalsefalse