He was grinning broadly and waving his trademark white handkerchief - a handkerchief that he sorely needed to wipe away perspiration in the boiling heat of the packed stadium.

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That changed a lot when the heat of fire was used for boiling water into steam to drive industry, which became large scale and controlled by a few people with countless labourers and employees, whose smaller scale business had come to be totally outcompeted and had no choice but to accept the working conditions that suited these new tycoons.

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As long as circulating water continues to remove this heat, pool water temperature is maintained well below boiling, typically below 120 degrees Fahrenheit .

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If it reaches a temperature that is too low, it automatically turns the heat up again, eliminating the need for a human to wait for it to reach boiling point and monitor whether it stays there.

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