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Galileo's escapement invented around 1637.
His escapement was the earliest design of a pendulum clock. Since Galileo was by then blind, he described the device to his son Vincenzio, who drew a sketch of it shown in the video.
In 1637, when he was 73, Galileo had the idea of a mechanism that would keep the pendulum swinging by giving it pushes, an escapement, thus allowing it to be applied to clocks. Since he was by then totally blind, he described the mechanism to his son Vincenzio, who drew a picture from his description. The son began construction of a prototype, but both he and Galileo died before it was completed.
Video Length 1 minute