Hear is a bit of additional content. In an operating (rotating and producing voltage) two brush generator, a probe could be stuck into the end frame to touch the commutator bars near the Armature brush. This sample voltage would be highest near the position of that brush, and taper to nothing at 90 degrees from the Armature brush. It is this voltage that is used for the field circuit in a three brush gen. That adjustability allows a farmer (or technician) to taylor charge rate to the use of the tractor. If there were no lights on the tractor (or other equipment like a stationary engine) the field current was unregulated through a fixed resistance wire wound resistor (usually in the same housing as the cutout), and tweaked with the third brush. If the tractor had lights, the charge rate was controlled by a (same resistance) fixed resistor on the light switch, and a direct ground of the field allowing the operator to choose to recharge the battery faster if many starts per hour were being made, or for cold weather operation for better recharging when the battery performance was compromised by low temps. The same switch shaft was used to turn on the lights, and at the same time keep the gen field full grounded. Jim
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Today's Featured Article - An AC Model M Crawler - by Anthony West. Neil Atkins is a man in his late thirties, a mild and patient character who talks fondly of his farming heritage. He farms around a hundred and fifty acres of arable land, in a village called Southam, located just outside Leamington Spa in Warwickshire. The soil is a rich dark brown and is well looked after. unlike some areas in the midlands it is also fairly flat, broken only by hedgerows and the occasional valley and brook. A copse of wildbreaking silver birch and oak trees surround the top si
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