What crucial component did James Watt conceive in 1765 to solve the Newcomen engine's wastefulness?

Answer

The separate condenser

Watt's solution was to divert the spent steam into a separate, permanently cooled vessel where condensation could occur, allowing the main working cylinder to remain constantly hot.

What crucial component did James Watt conceive in 1765 to solve the Newcomen engine's wastefulness?
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