[Milsurplus] Edison/Tesla battle finally ends in NYC.

[D C *Mac* Macdonald]

I remember touring the power plants on the
Canadian side of the Niagara River back when
I was young and lived only about 100 miles
away.  I could actually see the flicker of bulbs
running on 25 cps.
 
Mac - K2GKK
Oklahoma City
 
> From: ham at cq.nu> To: Radioman390 at cs.com> Subject: Re: [Milsurplus] Edison/Tesla battle finally ends in NYC.> Date: Thu, 22 Nov 2007 16:43:46 -0500> CC: milsurplus at mailman.qth.net> > Hi> > I seem to recall that certain of the NYC subways ran on 25 Hz power. > You could tell which ones they were by the way the incandescent bulbs > flickered.I believe they still generate 25 Hz at Niagara Falls for > some large industrial customers. The same thing is true in the Panama > Canal Zone.> > In all these cases the common denominator is the cost to convert > motors from 25 Hz to something else.> > Bob> > > > On Nov 22, 2007, at 4:29 PM, Radioman390 at cs.com wrote:> > > Con Edison, the local electric utility has finally stopped > > generating 120 VDC current for an older section of Manhattan. Edison > > fought Nichola Tesla's invention of AC current with a vengeance. He > > would have public demonstrations where AC was used to electrocute > > animals after they survived a DC jolt. (Yes, animals were harmed in > > this research).> >> > AC allowed step-up andd step-down transformers to make for easy long- > > range distribution of power; whereas DC networks required motor/ > > generator setups. (high voltage on long lines also have a lower > > voltage drop because of Ohms Law, and recovering lost voltage can be > > accomplished by a step-up transformer).> >> > NYC had for the longest time into the 60s, a second AC system of 25 > > Hz, which is why older radios have 25-60 Hz ratings. But DC only > > radios are doomed.> >> > BTW, 400 Hz is used in aircraft beceause less iron is need in the > > transformers than a 60 Hz design, saving weight. > > ______________________________________________________________> > Milsurplus mailing list> > Home: http://mailman.qth.net/mailman/listinfo/milsurplus> > Help: http://mailman.qth.net/mmfaq.htm> > Post: mailto:Milsurplus at mailman.qth.net> > ______________________________________________________________> Milsurplus mailing list> Home: http://mailman.qth.net/mailman/listinfo/milsurplus> Help: http://mailman.qth.net/mmfaq.htm> Post: mailto:Milsurplus at mailman.qth.net
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