How many revolutions per minute does the Stanley engine make?
The Stanley engine has the same number of revolutions per mile (924) no matter what speed or tractive effort it is developing. At 6 miles an hour it is making 92 revolutions per minute; at 15 miles an hour, 231; at 30 miles an hour, 462; at 60 miles an hour, 924, etc. It is always on “high gear” but it is never at high speed. Lubrication difficulties are, therefore, practically unknown.
