[time-nuts] A different timenuts interest

Richard W. Solomon w1ksz at earthlink.net
Thu Jul 22 11:25:44 EDT 2010


IIRC, there was a large one at Weston Observatory (Boston 
College). But, it has been 40+ years since I was last there.

73, Dick, W1KSZ


-----Original Message-----
>From: Flemming Larsen <oz6oi at yahoo.dk>
>Sent: Jul 22, 2010 1:47 AM
>To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
>Subject: Re: [time-nuts] A different timenuts interest
>
>The Exploratorium at The Palace of Fine Arts in San Francisco had one of these, and
>may still have it. I haven't been there in a while and don't know the details.
> 
>Nuts & Volts had a construction project for a continuously swinging pendulum in their
>September 2009 issue. It had a magnet at the end of the pendulum which generated
>a current in a coil mounted in the center of the base. A simple 2-transistor circuit would
>sense the pendulum swing and would generate a pulse in the same coil to accelerate
>the pendulum and keep it swinging in infinity, or until the battery died, whichever came
>first.
> 
>Have you looked for ideas on Bryan Mumford's website?
> 
>-- FL
>
> 
>
>--- Den ons 21/7/10 skrev Morris Odell <vilgotch at bigpond.net.au>:
>
>
>Fra: Morris Odell <vilgotch at bigpond.net.au>
>Emne: [time-nuts] A different timenuts interest
>Til: time-nuts at febo.com
>Dato: onsdag 21. juli 2010 17.13
>
>
>Hi all,
>
>I have been asked to help with the construction of a Foucault pendulum. This
>is a long pendulum which oscillates in a slow stately fashion in a fixed
>plane which appears to move as the earth rotates. In reality the surrounding
>environment is really moving relative to the plane of oscillation.
>
>The pendulum requires a sustaining system to compensate for the inevitable
>energy loss with each swing. The system is located in the building and
>therefore rotates relative to the pendulum. It needs to provide an impulse
>which does not affect the plane of oscillation of the pendulum. I was
>thinking of an electromagnet located below the centre of the swing which
>would be pulsed appropriately as the bob passes over it.
>
>Has anyone here had any experience with such a system of have any
>suggestions regarding the sustaining system? This is an interesting and
>challenging project.
>
>Cheers,
>
>Morris
>
>
>
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