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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