It is a Model T coil tester; built with a Model T magneto, and turned with the crank. You could test and adjust Model T coils with this machine after you changed the points.
Here is a neat gadget that every Ford mechanic needed in his shop in the Good Old Days. I will put the answer in Comments.
It is a Model T coil tester; built with a Model T magneto, and turned with the crank. You could test and adjust Model T coils with this machine after you changed the points.
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