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May 21st, 2018, 08:05 AM   #21
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Well then, my mother-in-law was surely a perpetual machinette....
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May 23rd, 2018, 05:45 AM   #22
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The main problem is that many people discussing perpetual motion machines do not consider the fact that such a machine must be, or function in, an isolated system with no energy exchange with the surroundings. Most machines marketed as perpetual simply rely on external energy sources.
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May 23rd, 2018, 08:50 AM   #23
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Quote:
The main problem is that many people discussing perpetual motion machines do not consider the fact that such a machine must be, or function in, an isolated system with no energy exchange with the surroundings.
Why should they?

I don't consider it a fact.
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May 26th, 2018, 09:32 PM   #24
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That's another category of machines which, though very interesting, I would not define as perpetual, unless one wants to use the term very loosely.
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