Automatic steering system which uses mechanical sensing by feelers straddling crop row; lightweight feelers activate low effort microswitches, which control relays carrying current to electric motor; tractor may be guided either by action of powered screw varying length of drag link or by steering wheel moving entire drag link.
"Automatic pilot" for farm tractors
Agric Eng
Agricultural Engineering ; 40 , n 2
1959
Article (Journal)
English
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