[time-nuts] A different timenuts interest

Bob Camp lists at rtty.us
Thu Jul 22 20:03:30 UTC 2010


Hi

I assume that was Napoleon III rather than the original....

(I'd hate to see the time-nuts list get banned by the French History
Police).

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of mike cook
Sent: Thursday, July 22, 2010 3:27 PM
To: time-nuts at febo.com
Subject: Re: [time-nuts] A different timenuts interest

As a number of examples have been referenced in the reply to the 
original post, I will add a note on one of  pendulums that Foucault 
himself constructed.
  Foucaults original experiments used shortish cables, but Napoleon 
wanted a more prestigeous affaire.  It was originally installed by 
Foucault in the Panthéon in Paris in 1851, but was moved from there in 
1855 to the  Musée des Arts et Métiers where it has been ever since. In 
the doc I found it appears that the original cable has been used since 
then.

The sphere :

    * steel, brass, lead .
    * diameter = 18 cm.
    * mass = 28 Kg.

The wire :

    * steel.
    * lenght = 18 m
    * has used since 1855.

The oscillation period of the Foucault's pendulum of the museum is 8,5 s 
and is apparent complete rotation occurs in 31,78 h = 31h 47 min at the 
latitude 48° 50 '.


  Unfortunately the cable reached its sell by date on the 18th May this 
year when it broke, dropping the ball on the marble floor , denting it. 
Most unfortunate.



Le 22/07/2010 04:02, Donald Henderickx a écrit :
>
> On 7/21/2010 7:13 PM, Morris Odell wrote:
>> 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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>>
> Hello Morris:
> You might contact Fermi National Accelerator Lab in Batavia Illinois 
> at www.fnal.gov .
> There Foucault pendulum is sixteen stories from the suspension point 
> to the atrium floor,it's impulse device is buried in the sand under 
> the bob.
> They may even have a picture of it on there web site.
> Try the public information office they should be able to get in 
> contact with the people that maintain it.
> If you are unable to get any help let me know as I might have some 
> contacts there that would help.
> Good Luck
> Don Henderickx
>
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>
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