< A Treatise on Painting
The shoulders or sides of a man, or any other animal, will preserve less of their level, in proportion to the slowness of their motion; and, vice versâ, those parts will lose less of their level when the motion is quicker. This is proved by the ninth proposition, treating of local motions, where it is 
said, any weight will press in the direction of the line of its motion; therefore the whole moving towards any one point, the parts belonging to it will follow the shortest line of the motion of its whole, without giving any of its weight to the collateral parts of the whole.
Chap. LXXXIII.—The Level of the Shoulders.
Plate 11.
Chap. 84.
Page 35.
London, Published by J. Taylor High Holborn.
Plate 12.
Chap. 84.
Page 35.
London Published by J. Taylor High Holborn.
Plate 13.
Chap. 85.
Page 35.
London, Published by J. Taylor High Holborn.
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