Old Mississippi River paddle wheelers routinely measured the river depths to avoid running aground. They used the unit "fathoms," where 1 fathom = 6 feet [ft]. The pilot would sing out "mark three· when the river was 3 fathoms deep and "mark twain" at 2 fathoms. The American writer Samuel Clemens took this as his pen name, Mark Twain. If we take 2 fathoms as a new unit, "twain," express 60 miles per hour (mi/h or mph] in units of twains per second [twain/s].
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