Which mechanical innovation allowed early steam engines (Newcomen) to automate cyclical pumping operations within 18th-century mines?

💡 Explanation

When water accumulated, Scoggin's self-acting snifting valve opened because of pressure differential, injecting cold water which condensed the steam and created a vacuum, causing the piston to move automatically. Therefore self-acting valve enabled automation, rather than Watt's condenser, Savery's chamber, or Trevithick's cylinder which served other functions.

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