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Picture No 10190546
Date 20th century
Description Clocks at Greenwich
Details

Left, Synchronome Free Pendulum at Greenwich Observatory, with right, the Slave Clock which performs its 'escapement' function, accurate to 1/100th second.
Source Cigarette card in Player's series 'Clocks old and new' issued 1928 20 of 20
Credit Mary Evans Picture Library
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