Put a clear tube 6ft in the air and conect one end to to vac pump and
the other in the bucket of water. this will give the amount of vacuum.this
can be calibrated to mercury and as it is much heavier the lift is much
less.

Robert Darrah wrote:

If you have a good vacuum pump, you could ruin it this way. If it is capable
of pulling only 3 inches mercury, it will pull about 6 feet of water.

Bob Darrah

 
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