Rich wrote:
> I am looking for a very low cost bell jar and vacuum pump. Does anyone on the list have one that they would like to sell?  I don't expect to pump down to ten to the minus 6 torr.  But I want to get down to the lowest possible pressure (below 100 u)


Depending on what you need it for, you may find a pressure cooker works 
for you.  I used one for several years and you can probably find them in 
second hand stores.  New ones are probably in the range of $20 to $40 or 
so.

For mine, I used a canning pressure cooker that is something like 12 
quarts in size.  A little vaseline on the edge and a rubber gasket 
between that and a slab of 1" plexiglas for a lid will seal the deal.

A hole was drilled and tapped and a plastic hose barb fitting for the 
vacuum hose was inserted with teflon tape.  Not quite as nice as a real 
bell jar but it worked perfectly for de-airing two part RTV rubber for 
mold making.
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