1257px-Lodge_sparkplug,_sectioned_(Autocar_Handbook,_13th_ed,_1935)

Published at 1257 × 1024 in a Brief History of Spark Plug Insulation
Lodge spark plugs with mica and steatite spark plug insulation

Lodge spark plugs were made with both mica and steatite in the early- to mid-twentiesth century.

Creative Commons License
1257px-Lodge_sparkplug,_sectioned_(Autocar_Handbook,_13th_ed,_1935) by Dr C M Helm-Clark PhD is licensed under a Creative Commons Attribution 4.0 International

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