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Re: Homemade stacked plate cap. *Need* a vacuum pump?




From: 	DamDeName-at-aol-dot-com[SMTP:DamDeName-at-aol-dot-com]
Sent: 	Saturday, November 01, 1997 3:57 AM
To: 	tesla-at-pupman-dot-com
Subject: 	Re: Homemade stacked plate cap.  *Need* a vacuum pump?

Hi Adam,

      A good vacuum pump can be made with an old refrigerator 
compressor --- there are several good articles is Scientific American
--Amateur scientist --- with regard to these ----

       Warm the oil moderately before adding to the cap.

        A  vacuum chamber does have to be better than
a rubber maid bucket (strength-wise )--- but it can be reinforced
---- consider --  wraping your cap in plastic (masking tape & light 
cardboard ---etc. on the sharp edges of the glass ) to prevent 
the plastic from being cut.allowing for an opening to the pump--- 
then packing the space between the cap & container with sand ---
--- a bit of eng./magic spit & "try it " & you can compress
the cap ,as you pump the container down
-- squeezing out the bubbles ---- (cycle it a few times )
any - way the method works ---  just depends  on 
ones imagination ---

   haveatit ---:>)
                           Sandy
 

In a message dated 97-10-31 00:06:44 EST, you write:

 >From: 	Adam[SMTP:absmith-at-tiac-dot-net]
 >Sent: 	Wednesday, October 29, 1997 8:26 PM
 >To: 	tesla list
 >Subject: 	Homemade stacked plate cap.  *Need* a vacuum pump?
 >
 >
 
 >
 >OK, here's the dilemma: I have no vacuum pump, and I don't intend to 
 >buy 
 >one.  Is this going to be a big problem? Is there a way do get the air 
 >
 >bubbles out of the cap without one?  According to my Electromagnetics 
 >Textbook, it would take 90,000V peak to punch through 90mil of 
 >polyethylene.  Shouldn't I have enough of a saftey margin here that a 
 >little air bubble isn't going to break the thing? Also, wouldn't a 
 >vacuum 
 >pump just crush my rubbermaid box down and break the seal? This thing 
 >is 
 >going to have a good 2" of airspace above it when I'm done (I could 
 >not 
 >find a box shorter than 5").
 >