This section is from the book "The Home Cyclopedia Of General Information", by Charles Morris. Also available from Amazon: Home Cyclopedia of Necessary Knowledge.
[L. pendulus.] An instrument consisting of a weight suspended from a fixed point, and free to swing to and fro by the alternate force of momentum and gravity. It is used to regulate the movements of clock-work and other machinery. The principal kinds in common use are - the simple, the compound, the mercury, and the gridiron pendulums.
SIMPLE PENDULUM
PENDULUM Lumilux
MERCURY
GRIDIRON
 
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