Re: magnetically quenched gaps

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

Original poster: "Ed Phillips by way of Terry Fritz <twftesla-at-qwest-dot-net>" <evp-at-pacbell-dot-net>

Tesla list wrote:
> 
> Original poster: "Jonathan Peakall by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <jpeakall-at-madlabs.info>
> 
> Hi All,
> 
> What about electromagnets? It seems it would be easier than using fixed
> magnets. Anybody out there ever make such a unit, and if so, what where the
> details?
> 
> Regards,
> 
> Jonathan Peakall

	Electromagnets would work fine, and were used in all of the old giant
arc transmitters.  Problem is the size and power.  If you need something
like 2000 gauss (0.2 Tesla for the purists in the crowd) across a 1" air
gap with a square inch of area you are going to need quite a large
device, fed with a lot of DC power.  Great big chunk of iron or steel
with lots of copper.  Something made up with enough of the NIB magnets
would be much smaller and more convenient.  Maybe there's somebody in
the group who will go to the trouble of designing the magnetic circuit.

Ed