From: bud-- <remove.budn...@isp.com>
Newsgroups: alt.comp.google,sci.electronics.design,sci.physics
Subject: Re: Who Invented Three-Phase?
Date: Sun, 26 Jun 2011 00:10:00 -0500
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On 6/23/2011 11:05 PM, Tom Potter wrote:
>
> "bud--" <remove.budn...@isp.com> wrote in message
> news:itvj5n$qoh$1@speranza.aioe.org...
>> On 6/22/2011 11:51 PM, Tom Potter wrote:
>>>
>>> "m II" <C...@in.the.hat> wrote in message
>>> news:4e01050b@news.x-privat.org...
>>>> -----BEGIN PGP SIGNED MESSAGE-----
>>>> Hash: SHA1
>>>>
>>>> On 06/21/2011 01:15 PM, HardySpicer wrote:
>>>>
>>>>> No, it's a method of distribution that is more efficient than single
>>>>> phase for the same amount of copper.
>>>>> Three phase supplies our homes - except we use only one of the phases
>>>>> of course. Small induction motor can run on single phase
>>>>> with a capacitor start to simulate a second phase.
>>>>
>>>> Distribution was a secondary benefit of 3 phase. The initial idea was
>>>> motor rotation and start-up without commutation or extra windings. The
>>>> ease of motor reversal was also in that initial idea. The rotating
>>>> magnetic field was the MAIN attraction.
>>>>
>>>> The root 3 factor in the volume of power delivery came in later. It
>>>> could be argued that 3 phase distribution happened only because the 3
>>>> phase motors were appealing to industry and most likely caused the end
>>>> of the somewhat dangerous belt and shaft method power distribution in
>>>> factories.
>>>>
>>>>
>>>>
>>>> mike
>>>
>>> Good analysis of the history of electrical power.
>>>
>>> Before Edison promoted electricity as a power source,
>>> typical factories used water power or a single steam engine
>>> coupled with leather belts
>>> to drive devices like saws, grinders, lathes, mills, etc.
>>
>> Interesting to look at old mechanical power installations. Long
>> jackshafts
>> going through the building with pulleys for power takeoff.
>>
>>>
>>> As high starting torque, single phase motors were not available,
>>> Edison promoted D.C. over A.C.
>>
>> AC was not considered useful. There weren't ANY AC motors.
>>
>>>
>>> Although Tesla cultists think that Tesla had a falling out with Edison
>>> because of money, it is more likely that he went to Westinghouse
>>> because of their differences about the immediate future
>>> of A.C. and D.C. motors in industry.
>>
>> Apparently Tesla biographers are cultists. They say the falling out was
>> about not getting paid what Tesla thought Edison had promised. Tesla was
>> so mad at Edison he left without a job prospect and wound up as a ditch
>> digger for a while. Westinghouse was much later, after Tesla set up a
>> laboratory and applied for patents.
>>
>>>
>>> Tesla had a great respect for Edison,
>>> and acknowledges that he learned a lot from him.
>>
>> I don't think so.
>>
>>> Considering that Tesla had access to Edison's technology
>>> and joined with a competitive company,
>>> it seems to me that Edison had more to complain about
>>> than Tesla.
>>
>> Fiction.
> <snip>
>
> THE AGE OF ELECTRICITY. by Nikola Tesla
>
> "Now I come to an interesting chapter of my life, when I
> arrived in America. I had made some improvements in dynamos
> for a French company who were getting their machinery from
> here. The improved forms were so much better that the
> manager of the works said to me: "You must go to America,
> and design the machines for the Edison Company." So, after
> ineffectual efforts on the other side to get somebody to
> interest himself in my plans financially, I came to this
> country. I wish that I could only give you an idea how what
> I saw here impressed me. You would be very much astonished.
> You have a? undoubtedly read those charming Arabian Nights
> tales, in which the genie transports people into wonderful
> regions, to go through all sorts of delightful adventures.
>
> My case was just the opposite. The genie transported me from
> a world of dreams into one of realities. My world was
> beautiful, ethereal, as I could imagine it. The one I found
> here was a machine world; the contact was rough, but I liked
> it. I realized from the very moment I saw Castle Garden that
> I was a good American before I landed.
>
> Then came another event. I met Edison,
> and the effect he produced upon me was extraordinary.
> When I saw this wonderful man, who had had no
> theoretical training at all, no advantages, who did all
> himself, getting great results by virtue of his industry and
> application, I felt mortified that I had squandered my life.
>
> I had studied a dozen languages, delved in literature and
> art and had spent my best years in ruminating through
> libraries and reading all sorts of stuff that fell into my
> hands. I thought to myself, what a terrible thing it was to
> have wasted my life in those useless efforts. If I had only
> come to America earlier and devoted all of my brain power to
> inventive work, what might I have done? In later life
> though, I realized I would not have produced anything
> without the scientific training I got, and it is a question
> whether my surmise as to my possible accomplishment was
> correct.

So Telsa was 'star-struck' when he went to work for Edison. He was well 
aware of Edison before he came to America. Working for Edison his 
opinion changed. He much later noted that if Edison had a basic 
scientific background he would likely have come up with a successful 
light bulb filament much faster. [Edison did not invent the light bulb 
but a practical light bulb that had reasonable life.]

>
> In Edison's works I passed nearly a year of the
> most strenuous labor, and then certain capitalists
> approached me with the project to form my own company."
>

I don't know if Tesla worked in Edison's lab (or if Edison had one his 
two famous labs when Tesla worked for him). Tesla was, for a while, a 
ditch digger after quitting Edison. He was a good inventor, but notably 
poor at developing commercial uses for his inventions (unlike Edison). 
Like for instance wireless/radio, where Tesla has some of the base 
patents. I don't remember the "capitalists" had anything to do with 
Edison. I have not seen anything that indicates Tesla gained 
particularly from working for Edison.