David Rooney, historian and former curator of timekeeping at the Royal Observatory Greenwich, is a director of the Antiquarian Horological Society and sits on the management committee of the Clockmakers' Museum, the world's oldest clock and watch museum.
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For thousands of years, people of all cultures have made and used clocks: city sundials in ancient Rome, medieval water clocks in imperial China, hourglasses fomenting revolution in the Middle Ages, the Stock Exchange clock of Amsterdam in 1611, Enlighten... SEE MORE