[GreenKeys] Why Dual Coil Electromagnets?

[Larry Tighe]

Bill,

I have 5 of them around my house.  They're tied into a WECo 17A  relay the 
sends 6 volts to the hourly reset coils keyed by an ESE 180A master clock.

I use the 2 D cells too...in a Radio Shack holder.....so far they've been 
running over 2 years!!! for the rewind coil.

Lar
K2JIA
www.antiquetelephone.com

----- Original Message ----- 
From: "bill riches" <bill.riches at verizon.net>
To: "'Bob Camp'" <ham at cq.nu>; "'Brooke Clarke'" <brooke at pacific.net>
Cc: <greenkeys at mailman.qth.net>
Sent: Monday, June 04, 2007 20:47
Subject: RE: [GreenKeys] Why Dual Coil Electromagnets?


>I have had one of the WU clocks running for about 10 years.  The
> originally used two #6 dry cells that would last 5  years or so or until
> they would start leaking.  I am powering mine with two D cells and
> change them once a year.  For all you need to know about those clocks
> look in "American Clocks - volume 2 by Gtran Duy Ly starting on page
> 177.
>
> 73,
>
> Bill Riches, WA2DVU
> Cape May, NJ
>
>
>> Maybe it relates to efficiency?  For example I have a Self Winding
>> "Western Union" clock that uses a pair of coils for the self
>> winding vibratory motor and another bigger pair of coils for the
>> hourly synchronizing electromagnet.  The winding motor runs from 3
>> volts (two 1.5 volt batteries).  It sounds like a small air
>> compressor that might be driven by a fractional horsepower motor,
>> yet the batteries are supposed to last a year.  I'll know in a
>> year, but for now think it must be a very efficient motor.
>>
>>
>
>
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