A balance scale holding 5 pounds on the left and 3 and 2 pound weights on the right showing 3+2=5.

"When two bodies of equal weight are connected by a rod, the centre of gravity will lie in the middle…

Two spheres of iron or other heavy material, connected by a short bar for a handle; used as a weight…

Two students drawing geometrical shapes on the chalkboard. A student is also using a scale while students…

An illustration of a lever with weights m and n with distances a and b from fulcrum. Illustration could…

Illustration of an ordinary steel-yard being used as a lever. F represents the fulcrum. Weight P is…

Illustration of a hydraulic machine. "A principle known as Pascal's Law states that pressure exerted…

"...represents a very valuable attachment for the whirling table. A ball of known mass slides on a horizonal…

A cylinder or roller for raising weights, turned by a crank or lever, with a rope or chain attached…