A Treatise on Painting
by Leonardo da Vinci, translated by John Francis Rigaud
The Equilibrium of a Man standing upon his Feet, Plate VI.
4003068A Treatise on Painting — The Equilibrium of a Man standing upon his Feet, Plate VI.John Francis RigaudLeonardo da Vinci

Chap. LXVI.The Equilibrium of a Man standing upon his Feet, Plate VI.

The weight of a man resting upon one leg will always be equally divided on each side of the central or perpendicular line of gravity, which supports him.