Harlan Van Gerpen is or was as American as anyone I know. I met him once after he retired and the company I worked for helped connect him with an agricultural tire maker to help design a vehicle load simulator. He had worked on one that Deere used to put a load on tractors for testing. They called them puffers. Tractors that had the engines converted to compressors. The load could vary according to pressure pop off valves and which gear the transmission was in. They had to be ballasted quite heavily, and I think I saw 3 hooked in series to make enough resistance to test large tractors. Harlan was a state senator in the 80's for several years.
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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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