Re: Coil design questions.

• To: tesla-at-pupman-dot-com
• Subject: Re: Coil design questions.
• From: Bryan Work <bryan-at-apexrad-dot-com> (by way of "Terry Fritz (moderator)" <twf-at-verinet-dot-com>)
• Date: Thu, 03 Dec 1998 07:00:19 -0700
• Approved: twf-at-verinet-dot-com

Tesla List wrote:

> Original Poster: PAULFRIEDMAN-at-webtv-dot-net (PAUL FRIEDMAN)
>
> A good  place to get a hand operating
> vacuum pump  -at- $35.00 is your local
> automotive  supply  shop. Note make
> sure it is made of brass.
>
> Paul A F

Another unlikely source is old medical supply houses that are found in
most communities. They sometimes have medical sump pumps that pull a
reasonable
vacuum (no way will they pull a hard vacuum though.) As the appearance
of these devices deteriorates their utility to the medical environment
decreases rapidly.
 Since aesthetics usually isn't a concern for hobbyists, (barring of
course the
grossness factor) they can be a real bargain. The guts of these systems
(no pun intended) have barely had a workout, rarely will they ever have
been expected to pull much below 50 torr, in spite of their ability to
pull down to
below 1 torr if driven.

Also, they will rarely have been exposed to any real  serious caustics
or solvents.
This combination is otherwise difficult to come by in the surplus arena.

Bryan Kaufman

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