Was the earliest possible date, (2) the description in Hero's Mechanics iii.
Lodge's Mechanics: A solid has both size and shape.
- Smoke-box, American Railway Master Mechanics' Association.
In mathematics, he was the first to draw up a methodical treatment of mechanics with the aid of geometry; he first distinguished harmonic progression from arithmetical and geometrical progressions.
His treatise was remarkable, not only as offering a satisfactory explanation of the coincidence between the lunar periods of rotation and revolution, but as containing the first employment of his radical formula of mechanics, obtained by combining with the principle of d'Alembert that of virtual velocities.