I've got a vacuum chamber that pull 27/28'' mercury
that should do it ;-)

Bruce

At 12:16 13/03/00 +0900, Jeffrey Swann wrote:
>Dear Andrew,
>I had a similar problem.
>I switched on a uwatec Bt on, in the plane on the way to the Solomons.
>It the registered a dive of 1.8m for the whole week.
>Realize that the pressure inside a jet is set at 8000 feet, or 0.8 ata.
>Hence it thought it was at 1.8m, on the ground.
>When I left the Solomons, I watched the guage ascend, untill it shut off
>when the plane was pressurized to 0.8 ata.
>You need to reduce the air pressure to about 0.7 ata.
>It does not need to be in water.
>Only air.
>If you can find a dental lab / dental technician, who has a vacuum investor
>for mixing plaster, that should pull the pressure down.
>You need some sort of chamber which will reduce the air pressure.
>Do you know a fighter pilot???
>Ha Ha.
>A dental suction unit should pull it down to that as well.
>Hope this helps,
>regards,
>Jeff the Darwinian.
>
>
>At 15:16 11/03/00 +0300, you wrote:
>>     List,
>>     My bottom timer seems to think that it is still at 2.7 metres and 
>>     so will not shut down!
>>     I've tried sending it on a dive attached to a line - no joy :-( 
>>     I've tried taking it on a subsequent dive - no joy :-(
>>     My thought was to place ithe timer in a crucible full of water 
>>     within a small bell and then to evacuate sufficent air from the 
>>     bell to 'con' the timer into surface mode, then to empty the 
>>     water from the crucible, finally restoring ambient pressure. 
>>     Any thoughts?
>>     A concerned Scot :-|
>>     Ace McAlpine
>>
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>
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Bruce Stewart
Triton Diving Equipment
www.triton-dive.com

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