Quoting Removed, click Modern View to seeI believe you would be right if what you were lifting was magnetic, but if lifting plain chunks of steel they won't care about the polarity, and will be attracted by both cycles. DC will be more efficient and lift heavier loads because it does not have the part of the AC cycle that is null. Besides the theory part, I have played around with electro magnets, both commercial ones and ones I wound myself. They worked on AC. That was many years ago, and at that time I did not have a DC supplye to power them. I was fairly young and never thought of connecting to a tractor battery.
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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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