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https://www.science-story-telling.eu/fileadmin/content/projekte/storytelling/zip/zip-de/zip-joule-2.zip
„Obviously Joule has no principal objection to a perpetuum mobile at this time; obviously he thinks that an inexhaustible source of power is practicable"(Breger 1982, p.194). 838 ft-lb/BTU; in einer zweiten