Which mechanism allowed miners to reliably extract water from deep Cornish tin mines in the 18th century?

💡 Explanation

When water accumulated in deep mines, the Newcomen engine was used because atmospheric pressure pushes a piston after steam condensation, driving a reciprocating pump to lift water. Therefore a reciprocating pump was crucial, rather than vacuum lift, cyclical suction, or rotary motion, which involve different engine designs.

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