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 - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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