[Prev][Next][Index][Thread]
Re: Primaries and Copper Tubing
Subject: Re: Primaries and Copper Tubing
Date: Wed, 23 Apr 1997 11:27:22 -0500
From: David Huffman <huffman-at-FNAL.GOV>
To: Tesla List <tesla-at-pupman-dot-com>
Gold is only slightly better than aluminum in resistivity. The one
reason
it is used in electronics is its resistance to corrosion. Silver is the
best conductor ignoring superconductors. It would be pretty hard to beat
good old copper tubing!
In the primary isn't there a few ohms of resistance at the spark gap? In
a
series circuit the primary resistance seems to be a small part of the
total.
silver p=1.59 microhm-cm
copper p=1.67 microhm-cm
gold p=2.35 microhm-cm
aluminum p=2.65 microhm-cm
iron p=9.71 microhm-cm
tungsten p=42.0 microhm-cm
carbon p=1375 microhm-cm
----------
> From: Tesla List <tesla-at-pupman-dot-com>
> To: tesla-at-poodle.pupman-dot-com
> Subject: RE: Primaries and Copper Tubing
> Date: Tuesday, April 22, 1997 8:55 AM
>
> Subject: RE: Primaries and Copper Tubing
> Date: Tue, 22 Apr 97 04:20:24 UT
> From: "William Noble" <William_B_Noble-at-msn-dot-com>
> To: "Tesla List" <tesla-at-pupman-dot-com>
>
>
> if I may say so, to your advice to scrap out work hardened copper
> tubing,
> "nonsense". yes copper work hardens, and purer copper does it more, but
> if
> you heat it with a torch it gets nice and soft again - heat up to the
> incadescent stage - at least a dull red glow. I would use an
> oxyacetolene
> torch, but propane or natual gas will get it hot enough also. You can
> immediately quench the copper, or not, it does't matter (it's not like
> iron
> where quenching affects the metallic lattice and thus hardness). The
> same
> technique applies to gold or silver (if any of you are making solid gold
> primaries, you will notice the lowest possible resistance, and the
> maximum
> resale value)
>