Helmholtz Coil (Re: anti-static device)

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

Original poster: "davep by way of Terry Fritz <twftesla-at-qwest-dot-net>" <davep-at-quik-dot-com>


> a helmshold

	Helmholtz
	The usual spelling is Helmholtz.  In respect of the inventor.
	(This is not a petty spelling comment.  When searching
	for, or describing, something use of the usual name helps
	others immensely.

	(hint:
	run a google search on 'helmshold'.  On the ENTIRE web,
	in any language, there are _3_ references: none to a coil...
	There are 89,000 (+) to Helmholtz.)

> coil is two equal wound coils with the same current in the coils
> (series) they are powered to cancel each other

	An excellent description of a Helmholtz Coil.

> and in doing so they cancel the surounding magnetic fields by
> physicly moving the lines of force outside of the coils.

	IF the surrounding filed is weaker than the locally
	generated one.

> A DC curent is adjusted until a magnetic compass goes limp, no
> direction of point.  Then inside the two coils is magnetic null
> and a gauss meter can be calibrated inside the null area with no
> outside influence.

	cf above.

> The coil in effect neutralizes magnetism.

	within limits.  cf above.

> The circuit is simple. Just two coils wired to cancel each others
> field with a common current in series. ie. 1 gauss - 1 gauss =
> 0 gauss = neutral.

	best
	dwp