Paddle propulsion developed from the same basic motion used in swimming and rowing, while the wheel turned an uneven human stroke into consistent mechanical work. The mechanism could make effective use of less-skilled labor because it delivered a repeatable stroke instead of demanding expert oarsmanship. River craft could use the current to wind a rope for an upstream return, while Chinese vessels used oxen to drive their wheels. These examples establish that steam did not invent the paddle wheel; it supplied a more scalable source of power for an existing propulsion idea.
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How paddle propulsion made power repeatable
Early paddle systems driven by people, river currents, and animals show how a repeatable mechanical stroke could provide consistency without expert rowing skill.