Engine Spark Plug Collection

How Mike Healy's gas engine became a diverse spark plug collection.

Clean point plug
During the early 1920s, the Barney Google comic strip featured a horse named “Spark Plug.” Door-to-door salesmen reportedly sold a Barney Google plug with a small check ball mounted in the side of the plug base. The selling point, besides the name, was the fact that the ball allowed air into the plug, keeping the electrode clean and the plug cool.