What a lot of great replies! I just have a minute right now, but I'll add that the spark-retard was really intended to stop knocking when the engine was running on kerosene, which had a strong tendancy to detonate in advance of the normal firing point. If you heard knocking under a heavy load, you reached down and pulled the spark over to the left until the knocking stopped. Some models of this series (10-20, 15-30/22-36) had a third tank, for water. If the engine knocked, you could turn on a little water to drip in (through the manifold, I think, but am not sure). I guess this cooled things off. Maybe somebody else knows exactly what this did?
Gosh, I'm really shy, but if you all insist, I will write about those other tractors that I drove and loved. A little aside: A few years ago, when my father was still farming a little bit, I found a decent F-20 and bought it, thinking I'd restore it and use it on his farm. Bring back memories and all that. I lived quite a distance from his place and never really found the time to do the restoration. But one day, I decided to hook the old girl up to a Bush Hog and go into one of those meadows that were studded with those things we called "hassocks" (don't know the botanical name)--a plant that made a very hard clump right in the middle. The experience reminded me of what a real handful an F-20 can be in rough ground. You sit out there on a stalk, which bounces up when the front wheels go down into a rut or a depression, and it bounces down when the front wheels go over something abruptly. The steering is beautiful as far as driving goes; the heavy iron wheel could actually be spun at the end of a row, but at the same time, if the front wheels went into a rut and you weren't watching yourself, the heavy iron wheel would act like a flywheel and come back and get your thumb, or that arm you had laid on a spoke while you lazily thought about something else. Well, that day kinda cured me of my romance with the F-20. Well, not really.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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