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I did manage to find technical drawings of the World's fair after considerable searching but probably I am not savvy enough to find the right items. In one of the drawings it does show what appears to be almost a geothermal structure of some type. Other drawings clearly show the alternating current generation room , and in fact that was one of the main attractions at the fair, but I cannot make out where the drive shaft is going to make it spin. Does anyone happen to be a late 1800 historian of the "alternating current wars" will probably know off the top of his head. Thank you

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    $\begingroup$ I once tried to find the answer to this question but gave up. My guess though it that the generators were steam powered. However, since the direct result of Westinghouse/Tesla success at the Chicago World's Fair was winning the power plant project at Niagara Falls, it could have been maybe Hydro but I have no idea where the Hydro source would have been. I am confident that the energy source was not Nuclear and Not Gas-Turbine (aka Jet engine). $\endgroup$ – K7PEH Jan 7 '18 at 18:39
  • $\begingroup$ The sketch I saw looked like there was a large pipe going under the ground...possibly hydraulic as you suggest but it appears to be a unique situation and that is way I was trying to find out how it was actually done. very puzzling to me....but thank you for trying./...by the way you can google on the 1982 World's fair and look at the schematics yourself...they are interesting but hard to figure out. $\endgroup$ – Sedumjoy Jan 7 '18 at 22:33
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The Tesla Society has a photo of a "Allis-Corliss Engine."
Wikipedia identifies this as a large steam-powered engine.

And over at vintagemachinery.org, it is stated explicitly that

The duty of the World's Fair [Corliss] engine will, however, be of a different nature from that of the Corliss engine at the Centennial, which transmitted its power to the main jack shaft. The Allis engine is belted by two belts made by the Page Belting Company, of Concord, N. H., to two Westinghouse dynamos, each of a capacity of 10,000 incandescent light. The speed necessary for these machines to produce 20,000 light of sixteen candle-power is 200 revolutions. The illustration shows only one belt, but when completed the second belt will be directly over the f1rst connected to the second dynamo immediately beyond. The fly-wheel is thirty feet in diameter, and at sixty revolutions, will have a periphery speed of over 5500 feet per minute. The face of the wheel is seventy-six inches, not as large as many others the Allis Company have built, but in construction it is probably stronger than any of its size ever made. It has twelve arms and the rim is made up of the same number of segments. It weighs complete 135,900 pounds, the rim itself weighing 88,000 pounds.

I'd add in passing that, having lived on Chicago's South Side only a few blocks from the Midway, I can attest there's no chance of a Hydro-powered source anywhere near there :-)

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    $\begingroup$ I have never lived in Chicago but been there lots of times and I never saw evidence of a nice Hydro source. I live in Washington state and the Columbia river has a zillion (or a little less) Hydro generating stations on it and I can usually recognize those kind of plants. $\endgroup$ – K7PEH Jan 8 '18 at 22:13

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