Therefore, to make clear one was referencing a clock’s time, they would say something like, “It is six of the clock” - which, over time, was shortened to “six o’clock”.ĥ. At the time, sundials were also common timekeepers. It comes from 15th-century references to medieval mechanical clocks. The term “o’clock” is a contraction of the term “of the clock”. It’s called the NIST-F1 Cesium Fountain Clock and gets its accuracy from a fountain-like atomic movement.Ĥ. It was never patented and rang only at one time - 4:00 am - to wake him for work.ģ. The National Institute of Standards and Technology in Colorado created an atomic clock so accurate they claim will neither gain nor lose a second in 20 million years. The first American alarm clock was invented in Concord, New Hampshire in 1787 by Levi Hutchins. A full restoration was completed in 1956.)Ģ. (The Salisbury Clock was actually replaced in 1884, and the original model wasn’t rediscovered until 1929. This mechanical clock dates all the way back to 1386. The oldest working clock in the world is the Salisbury Cathedral Clock in Salisbury, England. If you have any clock facts you’d like to share, be sure to let us know in the comments section.ġ. To kick off this discussion, we bring you seven clock facts for the curious clock lover. There is plenty of information that is relatively easy to find: How was the first clock set? What is the history of the pendulum clock? However, we think the obscure “time on the clock” facts tell just as much, if not more, about how clocks have evolved over the millennia. With such a rich history of timekeeping, there are many interesting little-known facts about clocks out there. Humans have been using clocks to track the passage of time for thousands of years.
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