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Updated: June 22, 2025
In working to put an end to the division between master and slave, we work for the happiness of both, for the happiness of humanity. We know this from Playfair, who mentioned it at Joule's death. When Socialists maintain that a society, freed from the rule of the capitalists, would make work agreeable, and would suppress all repugnant and unhealthy drudgery, they are laughed at.
Petersburg treated Mendeléeff with contempt, and how the Royal Society of London refused to publish Joule's paper, in which he determined the mechanical equivalent of heat, finding it "unscientific."
He demonstrated that a one-pound weight, falling through seven hundred and seventy-two feet and then arrested, produces sufficient heat to raise one pound of water one degree. Hence this is known as the mechanical equivalent of heat, or "Joule's Law."
He came to Joule's aid, started rolling the ball of controversy, and subsequently associated himself with the Manchester experimenter in pursuing his investigations. But meantime the acknowledged leaders of British science viewed the new doctrine askance.
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