Early clocks had variable hours, but even in the golden age of British horology, when Thomas Tompion made his masterpieces, a man relying on public timepieces could end his walk earlier than he had started. Huon Mallalieu traces the evolution of British clock-making.

The 23ft diameter clock face of the Elizabeth Tower — better known as Big Ben — in the Palace of Westminster, London. (Photo by John Downing/Express/Hulton Archive/Getty Images)
Early clocks had variable hours, but even in the golden age of British horology, when Thomas Tompion made his masterpieces, a man relying on public timepieces could end his walk earlier than he had started. Huon Mallalieu traces the evolution of British clock-making.