Abstract
The apparatus consists of a flexible quartz pendulum giving a perfect harmonic oscillation. The pendulum oscillates in a vacuum and hardly any damping takes place. Its surface is rendered conducting by metallization so that electrical forces can be applied to it. If required a permanent non linear characteristic can be given to the pendulum by this means. It can be excited into resonance by sinusoidal forces, which may or may not depend on its instantaneous position. The paper describes the properties of the apparatus and experiments made by exciting the pendulum with perturbations at a fixed frequency. The performance of the machine was found to be such that one can regard it as a small calculating machine (analogue computer).
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