[AT] Points

[Ron Cook]

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
>
>
>