24 Mar

File:PSM V88 D100 Oscillating electronic vacuum tube.png

‎{{int:filedesc}}: Added description of what the apparatus in the photo is, from another magazine article
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=={{int:filedesc}}==

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{{Information

{{Information
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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 [[:en:audio amplifier|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 or [[:en:transmitter|radio transmitter]]. 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.''" }}
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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 [[:en:audio amplifier|audio amplifier]], and as an [[:en:electronic oscillator|electronic oscillator]] to produce electronic music. 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.''" The article doesn't explain what the apparatus in the photo is, but the same picture appearing in the article [http://books.google.com/books?id=VigxAQAAMAAJ&pg=PA340&lpg=PA340 Lee De Forest, ''A Review of Radio'' in ''Broadcast Radio'' magazine (Doubleday, Page, and Co.), Vol. 1, No. 4, August 1922, p.340] is captioned: "''Dr. De Forest measuring the current in circuits employing a large-sized vacuum tube for wireless telephone transmitting.''"}}

|date=1916

|date=1916

|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

|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

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