Well, if it goes back to magnetos, I did find out why IHC was a stickler for the horseshoe magnet to have the IHC logo on the serial number side.
It was all due to the flow of current and which direction the spark would arc to on the points. IHC did that as a design point to have the stationary contact burn out faster. It was the cheaper one, so they minimized the farmer's cost. The stationary point is also easier to replace.
Reason I know that is because I have an original IHC mag book, and it explicitely calls that out. So, when they went to battery ignition, I wonder if that was the same reasoning.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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