Page:A Treatise on Painting.djvu/144

 wards, and so changes its situation at every change of posture.  

standing upon its feet without motion, will form an equipoise of all its members round the centre of its support.

If this figure without motion, and resting upon its feet, happens to move one of its arms forwards, it must necessarily throw as much of its weight on the opposite side, as is equal to that of the extended arm and the accidental weight. And the same I say of every part, which is brought out beyond its usual balance.  

can never be lifted up or carried by any man, if he do not throw more than an equal weight of his own on the opposite side.  

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.  

walking will always have the centre of gravity over the centre of the leg which rests upon the ground.

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