What is the standard measurement of the speed of ships?
Answer:
Knot: A log of thin quadrant of wood was
weighed to float upright and fastened to a line wound on a reel, and pieces of
knotted string were fastened to the log line.
The number of these knots which ran out while the sand glass
was running gave the speed of the ship in knots or in nautical miles – a
nautical mile is 6080 feet – per hour.
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