Dutchman’s log
navigational instrument
Quick Summary
The Dutchman's log is a historical method for estimating a boat's speed. It involves throwing a floating object, like a piece of wood, overboard from the bow of the ship. The navigator then times how long it takes for the stern of the boat to pass the object. This elapsed time, while the navigator kept the object in sight, was used to calculate the speed. This technique was eventually superseded by more advanced methods, such as using a knotted rope and a sandglass, and later by mechanical devices like the patent log.12
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