In article , Leo
Lichtman says...

... If the bell jar is an inch in diameter and several feet tall, the
aluminum plate would have to support only 11.5 lb, so it could be pretty
thin G.

But if it were a foot in diameter, then the force at the
center of the plate would be about 1600 pounds or so. The
height of the jar does not matter.

FWIW a commercial system might have a one foot dia bell jar
and a half inch thick stainless baseplate. The baseplate
has to be rigid enough to not oilcan excessively, because
the innards of the thing being pumped down are bolted to
it.

Jim


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