may 18, 1730 - Chronometer
Description:
A chronometer is like a compass, but it’s a watch. From Ancient Greek. A type of mechanical timepiece. It was coined by Jeremy Thacker of Beverley. The marine chronometer was invented by John Harrison in 1730. This was the first of a series of chronometers that enabled accurate marine navigation. From then on, an accurate chronometer was essential to deep sea marine or air navigation out of sight of land. Early in the Twentieth Century the advent of radiotelegraphy time signals supplemented the onboard marine chronometer for marine air navigation and various radio navigation systems were invented, developed, and implemented during and following the Second World War.
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Social Studies: Chapter 3: Exploration and Technology
Mrs. Riopelle's 5th Grade Class
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