Cold Mercury Hand Vacuum Pump?

[nawagi]

Any recommendations for a hand vacuum pump rated to 25″ Hg? Tried the autoparts store version with no success- sucks my thumb well but can’t draw down the bell jar. Thanks for your replies.

NWG

[photolytic]

The hand vacuum pump found in auto parts stores does not have enought capacity to evacuate a bell jar. A water aspirator sold in chemical supply houses is a cheap alternative if water consumpion is no problem. A small rotary vacumm pump used by refrigerator repairmen is the best option. You can by a used one on EBay or get a new one from artist supply houses like Danial Smith.

[nawagi]

Thanks John – I appreciate the help.

NWG

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