Froment's electrically driven pendulum

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Froment's electrically driven pendulum
Manufacturer	(unknown)
Production years	19th century
Production location	France

A method of maintaining a pendulum invented by Froment in 1854.

[edit] How it works

During part of a swing to the left an arm attached to the pendulum pushes against a spring, while for a rather longer portion of the return swing the spring pushes the arm, a balance of energy being thus available to keep the pendulum in motion. The impulse is imparted near the end of a swing, but its magnitude is independent of the voltage of the battery, and the force which drives the pendulum also presses the contacts together, thus making a reliable contact. This arrangement is similar to a gravity escapement in that the impulse is constant and independent of the driving force.

[edit] Memories

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[edit] In the Science Museum's Records

Inv. No: 1912-234