[AT] Points
Ron Cook
ron at lakeport-1.com
Thu Mar 9 09:49:08 PST 2017
Steve,
I can certainly buy the use of tungsten, but not the reason. The
hammering would seem to me to be the same in either application. I
rather suspect tungsten is much cheaper than platinum and iridium. I am
not educated in these electrical things, but I can certainly follow the
dollar. My old platinum points just seem to last forever whereas modern
point sets do not.
Ron
On 3/9/2017 9:46 AM, Stephen Offiler wrote:
> Hi Ron:
>
> I should have stated that I was conjecturing about the cadmium
> construction. Back about 20 years ago I was employed by a manufacturer of
> circuit breakers and the contact material of choice, by a wide margin, was
> the silver-cadmium I described. I had stuck in my memory that this was
> also used on breaker points. Not necessarily accurate!!
>
> I just took a real quick look and it seems platinum was actually alloyed
> with iridium to make it harder, and that was used in magneto points.
> However, battery and coil ignitions, according to the big wide Internet,
> used tungsten to better withstand the hammering they go thru.
>
> SO
>
>
>
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