As I understand it, farmers had to set "check wires," which had a series of knots at a certain spacing. The wires were lined up with fingers on the planter, and every time the planter encountered a knot in the wire, the fingers would "trip" and deposit a seed. It led to very uniform row spacing, as the check wires were re-used on the next set of rows...but as I understand it, the process was very time-consuming, as the check wires had to be repositioned as you moved through the field.
At least that's how my dad explained the process to me. I've never seen it actually used around here.
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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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