CLAUS LUNAU / SCIENCE PHOTO LIBRARY CLAUS LUNAU / SCIENCE PHOTO LIBRARY
Escapement clock mechanism, illustration. This clock mechanism is a double three-legged gravity escapement, designed for the Big Ben clock (the Great Clock of Westminster) in London, UK, in the 1850s. It was designed by Edmund Beckett Denison and George Airy, and constructed by clockmaker Edward John Dent.
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