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The balance is essentially a lever of the first class having equal arms, vintage line drawing or engraving illustration.
Illustration of physics, lever is a simple machine consisting of a beam or rigid rod pivoted at a fixed hinge or fulcrum, leverage is mechanical advantage gained in a system, law of the lever
It is an image of Lever of the First Kind, the image shows one hand holding the rope and at other side the weigh is hanged, vintage line drawing or engraving