拍品专文
"In 1657 Huygens applied Galileo's law of the pendulum to weight clocks, and Horologium Oscillatorium was published in 1673. It begins with a description of the pendulum clocks illustrated with diagrams of their mechanism. This is followed by the theoretical exposition of the motion of bodies, acceleration, and the fall of bodies along curves. This work also contains the first exact calculation of the intensity of the force of gravity and, at the end, the important theorems on centrifugal force, which aided Newton in the discovery of the laws of gravitation" (Sparrow).