21 Feb
2007
21 Feb
'07
7:51 p.m.
From: Marvin Johnston <marvin at rain.org>
Hi
As a kid, I had a motor from such a clock. The rotor was a cage of bars
that went by an electro megnet, run by AC. It would just sit and vibrate
until one gave it a start.
The shade pole motors replaced these because they'd self start. They
do use more electricity while running to induce current in the shading coil.
So, the clock runs a little hotter.
Dwight
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From: "Chuck Guzis" <cclist at
sydex.com>
I can remember seeing at least one project for a crystal-controlled
timing source using tubes (I think it used push-pull 6F6's in the
output stage) to run an ordinary synchronous-motor wall clock. This
would probably be during the 1940s or 50s.
Does anyone remember that the oldest of said wall clocks required the
owner to start the motor manually by spinning a little knurled shaft
located on the back?
I seem to recall a rumor where the power companies were offering to replace
at
no charge those clocks that needed to be mamually started (before my time.)
The
reason had something to do with using power that didn't register on the
power
meter. Anyone here know if this is fact or fiction?