PJ welcome to YT! You may have been led to mistakenly call it a disk plow due to the 3 round disks you see in front of each moldboard which are often called bottoms for short. The proper name of the disks are ..rolling coulters.. Their main function is to cut vegetation and other matter on top of the soil so that it separates cleanly. Then the moldboard flips it over and whatever was on top of the soil is now buried in the bottom of the furrow the previous share and moldboard has cut. Longer vegetation such as a corn stalk if not cut tends to get stuck on the beam that supports the bottom and multiple one build up there you eventually can get a plugged bottom. The rolling coulter was designed to help minimize this problem. The link shows an early blade or knife type coulter.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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