[time-nuts] A different timenuts interest

Jean-Louis Oneto Jean-Louis.Oneto at obs-azur.fr
Thu Jul 22 19:11:15 EDT 2010


I also think so,
 but Time-nuts are nuts about attoseconds, not decades... ;-}
Jean-Louis Oneto

----- Original Message ----- 
From: "Bob Camp" <lists at rtty.us>
To: "'Discussion of precise time and frequency measurement'" 
<time-nuts at febo.com>
Sent: Thursday, July 22, 2010 8:03 PM
Subject: Re: [time-nuts] A different timenuts interest


> 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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