Rusty has a good point. There are several factors involved transmitting enough horsepower for the job.
1. flexibility of the belt in that day and age. I think most were multi-ply cotton with rubber-like coating which had limits to their bending around small diameter pulleys.
2. RPMs of shafts have an effect on the centrifugal forces that discourage the belt from hugging the pulley for full grip.
If there were no standard belt speeds the operators could overspeed or underspeed the machine depending on the engine they had not matching what the machine designers had planned for.
I find it interesting that a 200 rpm steam engine could be used as well as a 700-1400 rpm gasoline engines.
Just had to size the diameter of the pulley to be useful, I guess. Leo
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