“The difference between "machines" and "engines" is obviously this, that machines need more workmen and greater power to make them take effect, as for instance ballistae and the beams of presses. Engines, on the other hand, accomplish their purpose at the intelligent touch of a single workman,…”

— Vitruvius, book De architectura

Source: De architectura (The Ten Books On Architecture) (~ 15BC), Book X, Chapter I, Sec. 3

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Roman writer, architect and engineer -80–-15 BC

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