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  •  Interesting (1+ / 0-)
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    enhydra lutris

    I always thought the vacuum tube predated the selenium rectifier.  Thanks!

    To believe that markets determine value is to believe that milk comes from plastic bottles. Bromley (1985)

    by sneakers563 on Fri Dec 07, 2012 at 01:07:40 PM PST

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    •  I could be wrong, I'll check. (0+ / 0-)

      That, in its essence, is fascism--ownership of government by an individual, by a group, or by any other controlling private power. -- Franklin D. Roosevelt --

      by enhydra lutris on Fri Dec 07, 2012 at 01:38:34 PM PST

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    •  asdf (2+ / 0-)
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      sneakers563, kurt

      Complex.

       Discovery of rectifying crystals in 1874, used as detectors in radios in 1906. Selenium, specifically, not used, at least for power applications, until the thirties.

      In 1873 a guy discovered the principle of the thermionic diode, but nothing like a real diode, and then in 1880, Edison rediscovered the principle and built and patented a diode tube. That went nowhere until  Fleming realized that it could be used as a detector & patented the first true thermionic diode in 1904. Strangely enough, it looks like they were first used as radio detectors in 1906, a tie with crystals, but preceding selenium per se.

      That, in its essence, is fascism--ownership of government by an individual, by a group, or by any other controlling private power. -- Franklin D. Roosevelt --

      by enhydra lutris on Fri Dec 07, 2012 at 01:55:24 PM PST

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