What was Leonardo da Vinci’s wheeled, spring-powered machine designed to do?

Leonardo da Vinci’s wheeled, spring-powered machine was designed to move by itself.

The machine, usually called Leonardo’s self-propelled cart, was drawn in the late fifteenth century. Two large springs stored energy and released it through a system of gears, allowing the cart’s wheels to turn without an animal pulling it or a person pushing it. A steering mechanism could be set in advance with a removable peg.

The cart was not an automobile in the modern sense. It had no engine, brakes, passenger cabin, or system for steering continuously during travel. Its programmed movement was more like an early mechanical automaton, and researchers have suggested that it may have been intended for theatrical scenery or ceremonial displays.

The design is often described as an ancestor of the car because it combined stored mechanical energy, wheels, and steering. Reconstructions have shown that the basic mechanism can work, although modern replicas sometimes simplify or reinterpret details in Leonardo’s drawing.