[time-nuts] Regulating a pendulum clock (Jim Palfreyman)

[Steve Rooke]

Sorry for double post, modem dropped during sending and a refresh on
the browser when it was up resent the message.

Steve

On 08/08/2010, Steve Rooke <sar10538 at gmail.com> wrote:
> This is very interesting and I wonder if the capabilities of this
> system being applied to any clock pendulum. If this sort of control
> any pendulum, then I wonder if it's possible to sync it to some
> standard.
>
> Steve
>
> On 08/08/2010, Don Mimlitch <donmeis at yahoo.com> wrote:
>> Jim Said:
>>>It also has a coil mounted near the pendulum and a fixed magnet on the
>>>pendulum bar and this coil connects to a box down below with a meter
>>>and a knob. They are labeled in sec/day. The electronics in the box
>>>are not clear (being quite old) but by measuring the current in the
>>>coil it quite simply increases the current one way to slow the clock
>>>and the other way to speed it up. (I'll admit the physics of this
>>>doesn't make sense to me - but it works!)
>>
>> I have a Warren Telechron Master Clock used in Power Stations in the 20's
>> to
>> regulate the 60 Cycle so that household clocks using synchronous motors
>> would be accurate to seconds a day.
>>
>> This clock has a similar permanent magnet at the end of the Pendulum and
>> a battery connected to a potentiometer to adjust the current flow
>> positive
>> or negative in an electro-magnet below the pendulum..
>> If the bottom of the magnet in the pendulum is "north" and the current in
>> the electromagnet is flowing such that its top face is North, then this
>> will
>> repel the pendulum causing its swing to be wider and contrary to common
>> knowledge the swing of a fixed length pendulum is not constant regardless
>> of
>> the swing. (Huygens discovered this in 1670 an found by forcing the arc
>> of
>> the swing to be cycloid instead of circular he could produce uniform
>> oscillation) Thus if the arc is longer the swing takes more time and the
>> clock runs slower.
>> If the current flows in the opposite direction and the two magnets
>> attract
>> then the arc is shortened and the clock runs faster. Of course my master
>> clock isn't as accurate as a Riefler pendulum clock. Also the magnet in
>> my
>> clock has lost it's magnetism over time and I can't use this regulation.
>>
>> So the goal of your adaptation is to have precision control of the
>> current
>> flow in the positive or negative direction. Others on the list are better
>> then me at describing how you might achieve this.
>>
>>
>>
>>
>>
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>
>
> --
> Steve Rooke - ZL3TUV & G8KVD
> The only reason for time is so that everything doesn't happen at once.
> - Einstein
>


-- 
Steve Rooke - ZL3TUV & G8KVD
The only reason for time is so that everything doesn't happen at once.
- Einstein