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Compensation Balance

a balance-wheel for a watch or chronometer, so constructed as to make isochronal (equal time) beats, notwithstanding changes of temperature. This effect is usually attained by having the balancewheel cut into two segments, the arcs being fixed at one end each. This allows space for the expansion and contraction with no variation in size of the wheel. a COMPENSATION PENDULUM, pendulum constructed of two different metals, as brass and iron, which so work against each other, that the expansion of the one downward is counteracted by that of the other upward. By this arrangement the pendulum does not vary in length, and consequently in frequency of vibration, whatever the temperature may be.