Re: Awesome Quarter Shrinking Capacitors on EBAY

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Paul Marshall" <klugmann-at-hotmail-dot-com> 

Last year I purchased (3) 25 kV 110 uF caps. Three in parallel will give 
you 103 kJ. I think I should have some Fuses in the circuit. Do you know 
anyone who is using fuses or where to get them ?


Paul S. Marshall





>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: Re: Awesome Quarter Shrinking Capacitors on EBAY
>Date: Tue, 07 Oct 2003 21:30:38 -0600
>
>Original poster: Bert Hickman <bert.hickman-at-aquila-dot-net>
>
>Tesla list wrote:
>
>>Original poster: "RIAA/MPAA's Worst Nightmare" <mike.marcum-at-zoomtown-dot-com>
>>Good point. With a few 50kJ tests without blowing anything up except air I
>>realized I'd have to treat the work coil as a bomb (sounds like one with
>>air). I thought manhole covers were iron? What if I used higher and higher
>>voltage in the coil (30kv limit at the moment, but can go much higher with
>>more caps and a rectified x-ray xformer (125kv), though I'd have to move to
>>the middle of nowhere). I agree nickels are stubborn (thanks to the weird
>>nickel alloy), but new (1983+) pennies are totally warped (not just shrunk)
>>with just 2500J (my first "shrinker") since they are mostly zinc. It seems
>>old pennies would be a perfect candidate since they are almost pure copper
>>(if you can remove the tarnish since they are hard to find without it). I
>>never tried it after the zinc penny goof (turned out to be a blob of
>>unrecognizable metal).
>>  > Hi all,
>>  >
><SNIP>
>
>Mike,
>
>This is getting pretty far off Tesla Coiling - you may wish to move the 
>discussion over to the HV List. The "sweet spot" for shrinking is a work 
>coil voltage between 10 - 25 kV. If you try to go significantly higher, 
>coil flashover becomes a serious problem - strong magnetic forces crush 
>the coil axially, in the process crushing the insulation that separates 
>adjacent turns. This causes flashover of the work coil before the current 
>peak can be reached, reducing the effective compression force that is 
>transferred to the coin. Bottom line - at higher voltages you'll make a 
>bigger bang, but the shrinking power is actually reduced. Once you begin 
>winding coils and discharging them be extremely careful - the 
>hypervelocity fragments are ejected with surprising force - these 
>little  pieces of shrapnel can blind, maim, or even kill an unprepared 
>experimenter.
>
>BTW, older pennies (Indian Heads and Wheat pennies through 1942) were made 
>from bronze (95% Cu, 2.5% Zn, 2.5% Sn), and wheat and Lincoln Memorial 
>pennies made between 1944-1981 were brass (95% Cu, 5% Zn). After 1982, 
>they are copper plated zinc. For a variety of reasons, Indian Heads and 
>old Wheat pennies work the best.
>
>Best regards,
>
>-- Bert --
>--
>-
>

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