On Thu, 23 Jul 2009 09:40:33 -0400, H the K
wrote:

I knew about Bosch but I had no idea Tesla was involved in the invention
of spark plugs. Thanks.

Tesla invented the coil. The ignition of gas, and later, gasoline,
engines was the obvious application. Before tesla there were huge
stationary engines used for pumping water. They had used a pilot
light, exposed to the combustable mixture with valve gear. Not for
high revs to say the least. With a plug instead of a flame port, it
was possible to compress the mixture before lighting it.

Casady