Looking at it where the spark plug wires are attached a distributor will have the center wire in the cap going to a separate round coil that is about 1/2 the length, and the same diameter as a ketchup squirt bottle. It may have a flange rib around it and be clamped in a metal bracket. The Mag will be a contained unit with the center wire going to a built in greyish black top on the unit. The mag will make spark with all wires disconnected from it, and never gets any power from the electrical system. (It makes its own) The distributor system might also be a Delco after market replacement that has a right angle drive with the cap pointing upward. (no mag looks like that) Some mags have been converted to be used as a coil system (and work OK) they have a coil as described above, and the unused built in coil on the top of the Mag. All coil systems need power through an ignition switch. All mags are grounded to stop with a similar looking, but very different switch. JimN
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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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