Collecting Antique Spark Plugs

Antique spark plugs tell tale of American industrialism and ingenuity

Plugs with glass insulators from Bob’s collection. “When you fired the engine, you’d adjust the carburetor to get the right color showing in the visible plug,” Lanning says. “They say it looked like the Fourth of July when they were running.”
Plugs with glass insulators from Bob’s collection. “When you fired the engine, you’d adjust the carburetor to get the right color showing in the visible plug,” Lanning says. “They say it looked like the Fourth of July when they were running.”