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 - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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