Re: Simple pendulum on round world

From: TMG (TMG_at_Nowhere.org)
Date: 09/01/04 

Date: Wed, 01 Sep 2004 16:17:33 -0400

Double-A wrote:

> TMG <TMG@Nowhere.org> wrote in message news:<f5WdnTKdirZEc6ncRVn-gg@comcast.com>...
>
>>Double-A wrote:
>>
>>
>>>herbertglazier@webtv.net (G=EMC^2 Glazier) wrote in message news:<4472-4133A8AC-287@storefull-3175.bay.webtv.net>...
>>>
>>>
>>>>Two Pendulums in the same room will swing in unison. take one pendulum
>>>>and change its swing in a minute it will be back in step Bert
>>>
>>>
>>>
>>>And where and by whom, pray tell, was this experiment performed?
>>>
>>>Citations?
>>>
>>>Double-A
>>
>>"In the same room" may (or may not) be beyond the actual effect. Google:
>>coupled pendulums
>>
>>Read about bound and loosely bound oscillators. If you mount two
>>pendulum clocks on the came wall, they will (eventually) end up
>>synchronized. I don't recall the bounds of "loosely".
>
>
>
> Thanks for the info.
>
> Seems that Christiaan Huygens, the inventor of the pendulum clock, did
> such an experiment with pendulum clocks.

There are more recent studies, but OK.

> But contrary to what Bert said, not just any two clocks in the same
> room will swing in unison.

Yes - my point about maybe pushing the effect.

> In the first place, the two clocks have to be identical and have a
> pendulum swing rate that is very nearly the same to start with. The
> two clocks have to be hung from the same support. This makes them
> coupled pendulums.

Or loosely coupled pendulums.

> Huygens tried hanging one clock on the other side
> of the room, and it went out of synchronization.
>
> The pendulums don't really swing in unison. They swing 180 degrees
> out of phase with each other. But they will keep the same time so
> long as they are linked in this way.

Which I tried to lead you with "synchronized". You say "potato", he says
"potato". Wait, that doesn't really work in a typed format.

> Also the clocks have to be in a certain weight range. Huygens was
> working with heavy clocks that he was trying to get to run aboard
> ships. But if the clocks are too heavy or too light, the effect won't
> work.
>
> Also, it takes about a half an hour for the clocks to become
> synchronized, not the one minute that Bert said.

Thus my "eventually".

> Double-A

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