I don't know anything about moldboards as I grew up in South Texas and we used disk plows -- we called them "breaking plows" as like the moldboard they were used to turn the soil as one of the first operations after harvest. The disk plow and moldboard do the same thing. Disk plows are used mostly in the south, I believe, as they don't work as well in wet soil as the moldboard. On the contrary, I don't think moldboards work very well in dry soil -- I have never tried it. A disk plow has less soil resistance than a moldboard because the disks turn. Because of this, as an example, an H is a two plow tractor. It will easily pull the HM 150 semi-mount with three disks, and cut the same width as the equivalent 3 botton moldboard. Disk plows are often confused with the one-ways or "tillers" as we called them. They are not the same as the disks on a one way work at less angle, thus there are more of them and the width of cut is wider than that of a disk plow, it is also operated at a shallower depth. Disk plows and moldboards are primary tillage tools, a one way is a secondary tillage tool, although in the Great Plains they were used as primary tillage tools after wheat harvest, seldom used any more. I realize this is probably more than you wanted to know.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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