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Spark Plug Tester --- (circa 1917)

Keep Spark Plugs Clean By Using White Rose Motor Gasoline -and- National Carbonless Motor oil

I believe these Spark Plug Testers were given out about 1917. They were made by M.(?) Jackson & Co. , Chicago and are 3 1/2 " long . The photo below (Jan.18th, 1917) illustrates the beautiful artwork of Canadian Oil's letterhead of the era. A similar style letter, with detailed instructions, was given out with the testers. Touching the tips to the plug terminal and base causes a spark to jump the gap in the tester. They could also be used to test the battery or magneto. . Close examination will reveal Sales and Distributing Points of the era .

"In using WHITE ROSE MOTOR GASOLINE and NATIONAL CARBONLESS MOTOR OIL you double the life of your spark plugs by preventing the formation of soot or carbon deposit ."

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