[time-nuts] A different timenuts interest

jmfranke jmfranke at cox.net
Thu Jul 22 19:24:28 EDT 2010


Actually, I think you can find a time-nut for any span of time, 
sub-nanosecond to leap seconds, to leap years, to ...

John WA4WDL

--------------------------------------------------
From: "Jean-Louis Oneto" <Jean-Louis.Oneto at obs-azur.fr>
Sent: Thursday, July 22, 2010 7:11 PM
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Subject: Re: [time-nuts] A different timenuts interest

> 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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>>
>>
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>
>
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