The main contribution that Nikola Tesla made to commercial power distribution is NOT, as many would think "ac power". It is MULTI-PHASE power that Tesla invented and perfected. The three-phase power that is ubiquitous today is essentially unchanged from the three-phase power that Tesla and Westinghouse used in their Niagara Falls generation plant.
Tesla licensed his three-phase motor design to Westinghouse on a per-horsepower basis. When Westinghouse realized how successful multiphase power would become, and how much he'd have to pay Tesla in royalties, he asked Tesla to renegotiate the deal. Tesla felt indebted enough to Westinghouse that he simply signed over his patents Westinghouse, a decision that made the fabulously wealthy Westinghouse even richer.
Interestingly, the last bit of Edison's DC power distribution system in NYC was taken out of service just a few years ago. It was still powering elevators and escalators in a few old buildings.
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Today's Featured Article - Tractor Profile: Ferguson TO-20 - by Staff. When the infamous "Handshake Agreement" between Henry Ford and Harry Ferguson fell by the wayside (that's a story in itself), Harry Ferguson quickly set up manufacturing plants for a United States version of his English TE-20. The TO-20 was relatively the same as the TE-20 except utilized some different casting materials and had a US-style electrical system. The TO-20 was a dead ringer for the Ford 9N and 2N models and they say that Ferguson did this on purpose when the Handshake Agreement wen
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