PSN-L Email List Message

Subject: Re: General Diamagnetic Tiltmeter Improvements
From: "meredith lamb" paleoartifact@.........
Date: Wed, 5 Dec 2007 21:46:52 -0700


Hi Chris,

Will try to "engineer" some kind of aluminum sleeve; but of course with some
weight
limitations involved.

Will have to see about the dampening route you suggest.

As for the steel application, that would also work.  I can't remember
exactly the
thickness of steel that might be best (?); perhaps somewhere around 0.0315"
thick;
but perhaps just about anything, would be better than nothing.

Its possible to "stick" any photocells used to one side or the other of the
PG
on the magnet/s and/or its aluminum.

Take care, Meredith

On Dec 5, 2007 4:46 PM,  wrote:

>   In a message dated 05/12/2007 22:40:03 GMT Standard Time,
> paleoartifact@......... writes:
>
> I've put up another "table top test" web page in regard to diamagnetic
> levitaion of pyrolytic
> graphite as it could be used in a tiltmeter.
>
>  Hi Meredith,
>
>     Can you make a rectangular U out of 5 thou or similar Al foil and
> stick this lengthways on the Graphite strips, maybe one side with a slot for
> photocells?
>     Then make an inverted U structure out of mild steel, support it
> centrally on the outside magnet pairs and fit it with a mild steel
> bolt downwards over the centre of the Al U channel? Screw down the end of
> the steel bolt until you get about the right damping?
>     The other way of evening out the magnet field is to use thin strips of
> Iron (galvanised?) to sit on top of the three magnets, maybe with the edges
> filed off at 45 degrees?
>
>     Regards,
>
>     Chris
>
Hi Chris,
 
Will try to "engineer" some kind of aluminum sleeve; but of course with some weight
limitations involved.
 
Will have to see about the dampening route you suggest.
 
As for the steel application, that would also work.  I can't remember exactly the
thickness of steel that might be best (?); perhaps somewhere around 0.0315" thick;
but perhaps just about anything, would be better than nothing.
 
Its possible to "stick" any photocells used to one side or the other of the PG
on the magnet/s and/or its aluminum.
 
Take care, Meredith 

On Dec 5, 2007 4:46 PM, <ChrisAtUpw@.......> wrote:
In a message dated 05/12/2007 22:40:03 GMT Standard Time, paleoartifact@......... writes:
I've put up another "table top test" web page in regard to diamagnetic levitaion of pyrolytic
graphite as it could be used in a tiltmeter.
Hi Meredith,
 
    Can you make a rectangular U out of 5 thou or similar Al foil and stick this lengthways on the Graphite strips, maybe one side with a slot for photocells?
    Then make an inverted U structure out of mild steel, support it centrally on the outside magnet pairs and fit it with a mild steel bolt downwards over the centre of the Al U channel? Screw down the end of the steel bolt until you get about the right damping?  
    The other way of evening out the magnet field is to use thin strips of Iron (galvanised?) to sit on top of the three magnets, maybe with the edges filed off at 45 degrees?
 
    Regards,
 
    Chris


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