[time-nuts] Self winding clock co. Weatern union clock
bill at iaxs.net
Sun Jan 31 23:32:59 UTC 2010
It's humbling to know that someone on the Internet already has
found the answer to something that puzzles me. Worse, I had a
feeling of déjà vu as I read your article.
You asked about the Type "A" pendulum in the article. I looked
to see if Google had found an answer. It had. The link is:
Look down near the bottom of the article where a figure shows the
three types - A, B, and C. There's a few paragraphs about the
striking mechanism, and then all is revealed.
Thanks for maintaining a very informative site.
O.T.P.S. If anyone is trying to play tapes made between 1975 and
1985, and they stick so bad they won't play, look up "baking
tapes" before you destroy them. The sticking can be fixed.
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Brooke Clarke
Sent: Sunday, January 31, 2010 4:03 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Self winding clock co. Weatern union clock
The clocks were on a synchronization line in series and the source power
supply was 200 VDC. A high power adjustable series resistor was in
series to set the loop current. The loop was closed one second prior to
top of the hour and opened at the top of the hour. The reason for the
high voltage is that the time constant is L/R so the higher the R the
faster is the circuit. This is exactly the same as how Teletype
machines are able to operate. You can use a bench power supply in
constant current mode and just turn up the current until the
synchronizer pulls in and not the voltage across it. See:
Corby Dawson wrote:
> I picked up a nice big clock that has "self winding clock co. New York"
> and "western union" on the face.
> After some research on the web I connected a 3V battery up and it wound
> itself OK.
> Fiddled with the orientation a bit to get the pendulum swing balanced and
> it seems to be running OK now.
> How to I advance or retard the hands to set the time?
> Also how do I test the synchronizer?
> I see two Fahnestock clips That look to connect to the synchronizer
> With an appropriate interface can I synchronize it to a GPS 1PPH?
> Corby Dawson
> Small Business Tools
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