I can't answer any of your questions, but I would like to add a little information.
Certain Oliver tractors had, as an option, the Thomas variable drive unit. This was in the 1940's and 50's model 60, 66 and 77 standard and industrial tractors.
Several years ago I was in contact with a man in ND that had a 60 industrial with one, and I sent him a copy of the information I had. I didn't stay in touch with him to know what he did with the tractor.
Oliver also used that unit in their model 40 self propelled combines.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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