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A simple apparatus for the determination of g by free fall

The apparatus is of the ball-attached-to-an-electromagnet type with an electronic timer to measure time of descent through a known distance. The accuracy has been improved by attaining a thin copper wire to the ball and arranging the circuits in such a way that the timer does not start until the ball actually leaves the electromagnet (not when its field is cut off and starts decaying) and a circuit is completed when the ball strikes a metal pad at the end of its fall. The accuracy of the measurement is 0.3%.