Leonardo da Vinci designed a dynamometer to measure the force needed to move a load.
A dynamometer measures force or power. Leonardo’s version used a suspended basket that could be filled with sand, together with ropes, pulleys, and a moving counterweight. By observing how much sand was required to move the load, an operator could estimate the pulling force produced by a person or mechanism.
The instrument reflects Leonardo’s interest in quantifying mechanical work rather than merely drawing machines. His notebooks contain investigations of friction, lifting, gears, and the behavior of bodies in motion. These studies connected practical engineering with the mathematical analysis of machines.
Leonardo’s dynamometer should not be confused with an odometer, which measures distance, or a modern electronic dynamometer, which may measure torque, engine power, or tensile force. The historical device was a mechanical force-measuring instrument and belongs to Leonardo’s broader work on experimental mechanics.