On Fri, 17 Sep 2004 23:39:40 -0400, Jeff Wisnia
wrote:

Jeff Wisnia wrote:

jim rozen wrote:

In article , Eric R Snow
says...


And sparkplugs have been metric for years. Blew me away when I
measured the threads on an antique sparkplug made in America for
domestic use and found out they were metric.



IIRC at one time sparkplugs were also NPT.

Jim



You remember right Jim, and some of them also disassembled for cleaning!

Here's one like that I picked up at an antique shop in Minnesota a few
years ago. A copper gasket seals the porcelain to the body.

Dual ground electrodes too!

http://home.comcast.net/~jwisnia18/jeff/plug.jpg

Jeff




Before someone jumps on me, the copper gasket seals to the metal band
fused to the porcelain, OK?

Jeff

What is something like that worth? I think I have one in a box out in
the shop. I didn't realize it came apart.