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traneus
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Edison effect
traneus   2/28/2017 8:15:05 PM
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Thanks for the note about Edison's assistant William Hammer. My statement was based on the description in Edison's 1884 U.S. Patent 00,307,031, which shows that Edison at least somewhat understood the rectifying effect when he wrote the description. Of course, he would have learned that from Hammer.

Edison states that "a portion of the current will, when the lamp is in operation, pass through the shunt-circuit thus formed {the diode plate circuit}, which shunt includes a portion of the vacuous space within the lamp", without mentioning the yet-to-be-discovered electron.

en.wikipedia.org/wiki/Thermionic_emission states that the Edmond Becquerel discovered the effect in 1853, and that Frederick Guthrie discovered the same effect in air in 1873.

en.wikipedia.org/wiki/J._J._Thomson states that Thomson discovered the electron in 1897, and has a description of his experiments with cathode rays.

TFCSD
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Re: What's a Good Name for a Future Engineer?
TFCSD   2/28/2017 7:43:09 PM
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@ Max

You're right. It should be unskilled applicant. "Worker" implies skills and past experience while "future" implies no skills and no experience. Shades of Catbert. ;-)

Max The Magnificent
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Re: Vacuum tube patents
Max The Magnificent   2/28/2017 1:38:48 PM
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@Traneus Rex: Edison did invent the vacuum tube diode, and knew it, but had no use for it!...

Wasn't it Edison's assistant, William Hammer, who discovered that electrons flowed through the vacuum of an incandescent bulb -- and thsi effect subsequently became known as the Edison Effect?

traneus
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Vacuum tube patents
traneus   2/28/2017 11:53:28 AM
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Edison did invent the vacuum tube diode, and knew it, but had no use for it!

Here are four key U.S. patents on the early vacuum tube:

00,307,031 issued 1884, Thomas Edison, "vacuous" diode used as voltmeter (plate current depended on filament voltage). Edison was aware of the polarity-sensitive property of his diode, but worked with direct current only, so had no use for a rectifier.

00,803,684 issued 1905, Reginald Fleming, vacuum diode rectifier for radio.

00,879,532 issued 1908, Lee DeForest, gassy triode detector for radio. DeForest specified that a "conducting gaseous medium" was necessary for operation. DeForest used a capacitor in series with the grid to block DC grid current, and let the gas determine the grid voltage.

01,558,436 issued 1925, Irving Langmuir of General Electric, vacuum triode detector and oscillator for radio. Langmuir patented the vacuum (so has a patent on the absence of gas). Langmuir filed in 1913, but issuance of this patent was delayed until eight months after DeForest's patent expired, so triode vacuum tubes were under patent until 1942.

Harold D. Arnold of AT&T independently invented the triode vacuum tube for telephone use, but I do not have his patent number.

Remember that a major purpose of the U.S. Patent Office is the creation of expired utility patents as an open record of technological how-to. The limited-term patent monopoly is merely a means to this end.

Max The Magnificent
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Re: What's a Good Name for a Future Engineer?
Max The Magnificent   2/28/2017 10:25:49 AM
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@TFCSD: Unqualified worker?

I was feeling quite cheerful this morning -- then I read your comment -- now I'm feeling sad :-(

TFCSD
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What's a Good Name for a Future Engineer?
TFCSD   2/27/2017 11:36:36 PM
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Unqualified worker? ;-)

Max The Magnificent
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Re: Belated Inspiration
Max The Magnificent   2/22/2017 3:12:23 PM
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@perl_geek: ...an "Edison vs Tesla" flamewar..

Would that be the same Edison that didn't create the world's first incandescent bulb and who missed the chance to invent the vacuum tube 21 years before British electrical engineer and physicist John Ambrose Fleming created the vacuum tube diode?

I think I've heard of him LOL

perl_geek
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Re: Belated Inspiration
perl_geek   2/22/2017 1:39:38 PM
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Now we can hijack the thread for an "Edison vs Tesla" flamewar. :-)*

Rcurl
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Re: Belated Inspiration
Rcurl   2/22/2017 10:22:47 AM
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Don't know why I didn't think of this earlier, but I think Edison would be a fine first name - aside from the probability that his friends will call him "E.T."

Max The Magnificent
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Re: Belated Inspiration -- for the wrong field
Max The Magnificent   2/22/2017 10:20:38 AM
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@David: ....our parliament on TV often looks like an unsupervised kindergarten class...

You think you've got it bad... you should see what it's like over here in the USA these days... I'm scared to turn my TV on to discover the Disaster du Jour (we consider ourselves lucky if there's only one :-)

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