24 Mar

File:PSM V88 D100 Oscillating electronic vacuum tube.png

‎{{int:filedesc}}: Added more complete description and source details
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=={{int:filedesc}}==

=={{int:filedesc}}==

{{Information

{{Information
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|description={{en|1=Oscillating electronic vacuum tube}}
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|description={{en|1=Inventor [[:en:Lee de Forest|Lee de Forest]] ''(left)'' and another man experimenting with an [[:en:audion|audion]] amplifier equipment. The Audion tube ''(inset, top)'', the first [[:en:triode|triode]], invented by de Forest in 1906, was the first [[:en:vacuum tube|electron tube]] that could amplify. Its amplifying properties were only discovered around 1910-1912; this picture is from a 1916 Popular Science magazine article which describes its newly-discovered uses as an audio amplifier, and as an [[:en:electronic oscillator|electronic oscillator]] to produce electronic music. The article doesn't explain what the equipment in the picture is; however the man on the right speaking into the microphone suggests it might be a demonstration audio amplifier. The caption gives a simplified description of how the tube works in a radio receiver: "''In appearance the audion closely resembles an electric light bulb. Built into the bulb are two metal electrodes which are connected in such a way that a perfect electrical balance is maintained between them. When a wireless wave disturbs this balance, the disturbance is heard in the telephone receivers.''" }}

|date=1916

|date=1916
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|source=[http://www.archive.org/details/popularsciencemo88newyuoft Popular Science Monthly Volume 88]
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|source= George F. Worts ''Band Concerts from an Electric Light Bulb'' in [http://www.archive.org/details/popularsciencemo88newyuoft ''Popular Science Monthly'', Volume 88, No. 1, January 1916], p. 72

|author={{unknown|author}}

|author={{unknown|author}}

|permission=

|permission=

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