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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