What type of machine did Leonardo da Vinci sketch for producing continuous motion from falling weights and water?

Leonardo da Vinci sketched a perpetual-motion machine while studying mechanisms driven by falling weights and water.

Leonardo examined many devices that appeared capable of producing continuous motion. His notebooks include studies of wheels, weights, screws, and water-powered arrangements. These investigations were part of his broader work on mechanics, not evidence that he had discovered a machine able to create unlimited energy.

A perpetual-motion machine cannot operate indefinitely while delivering useful work without an external energy source. Friction, air resistance, and energy conservation prevent such a device from running forever. Leonardo eventually recognized the difficulty and wrote critically about attempts to achieve perpetual motion, helping distinguish mechanical investigation from a successful invention.

The subject is often mixed up with Leonardo’s practical waterwheels and pumps. Those machines could transfer or use energy supplied by flowing water, but they could not generate energy from nothing. Leonardo’s sketches are historically valuable because they document a serious Renaissance effort to understand why attractive mechanical arrangements fail.