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: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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