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(Chuck Sherwood) wrote:

My 11 year daughter is showing a strong interest in science.
We received a Edmunds catalog with lots of cool stuff in it.

I have always wanted to play with vacuum stuff when I was a kid
and I didn't get much of a chance so I figure now is my chance.

I figure it would be cool try to make a crude light bulb inside
a bell jar and things like that.

I looked at ebay and there are many vacuum pumps FA.

Do I need a two stage pump and how big of a pump do I need?
The killer is these things are heavy and shipping is expensive.

chuck

Take a look at the gast pumps, they seem to be much lighter,
especially the oiless rotary vane ones. Shipping seems to be around
25-40. What you need sort of depends on what you want to do with it
too.
You can get all of the max vac and flow rate information for the gasts
out of their on line info (some times you have to dig a little and
figure out their catalog # systems)
jk