Draft control was also an attempt to help build a smoother seedbed. With no draft, if you encounter little hills and valleys, as the rear goes up and down your inplement would go shallow or deep. The draft kept the implement in the ground at the same depth as the longitudinal axis of the tractor changed quickly and often.
It also helped compensate for varying soils. Light loose stuff, one depth setting, when you came to heavysoil, it would come up a little resulting in the same "volume" of soil being turned. This made a smoother field.
You have to think about what plowing problems IH was trying to solve.
The biggest one was very bumpy field when done.
My Dad plowed with four Horses! Sometimes five if you were training a colt.
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