Probably just happened that the gearing in the inventor's setup resulted in 536 RPM, and it seemed to work. Of course, any speed in that area would "work", because you design the implement to whatever the standard is.
More curious to me is baseball- and the 90 foot base path distance, and 60' pitching distance. Both also "work"- runners are usually "out" by less than a step on a routine grounder. But when someone speedy like Ichiro of the Seattle Mariners comes along, he beats out a significant number of infield hits by being just a step or two faster. And base stealing also usually results in close plays. And breaking balls pitched make their break just before getting to the hitter, thereby fooling him.
When my daughter played 10 year old softball, her team had a devastating pitcher- nobody could hit her. Nobody intentionally threw breaking balls yet- they were still working on speed and control. Batters always stood at the back of the batters box, to get the most time possible to swing.
Opposing coach was watching each of his girls strike out, swinging just over the ball. He called time, went out and moved his batter to the front of the box. She didn't want to, but he insisted. She got a hit. From then on, everybody got a hit; it seems that the pitches were "breaking" slightly downward, and by moving the batter forward, she was getting the ball before it broke. That was pretty much the end of Brittany's pitching career.
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Today's Featured Article - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family�s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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