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speeddman
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This example is highlighted in the Wikipedia definition of perpetual motion.
Machines which are claimed not to violate either of the two laws of thermodynamics but rather to generate energy from unconventional sources are sometimes referred to as perpetual motion machines, although they are generally considered not to meet the standard criteria for the name. By way of example, it is possible to design a clock or other low-power machine, such as Cox's timepiece, which runs on the differences in barometric pressure or temperature between night and day. Such a machine has a source of energy, albeit one from which it is impractical to produce power in quantity.
Is gravity considered an unconventional source of energy?
Or can a perpetual motion machine take advantage of gravity?
http://en.wikipedia.org/wiki/Perpetual_motion
Machines which are claimed not to violate either of the two laws of thermodynamics but rather to generate energy from unconventional sources are sometimes referred to as perpetual motion machines, although they are generally considered not to meet the standard criteria for the name. By way of example, it is possible to design a clock or other low-power machine, such as Cox's timepiece, which runs on the differences in barometric pressure or temperature between night and day. Such a machine has a source of energy, albeit one from which it is impractical to produce power in quantity.
Is gravity considered an unconventional source of energy?
Or can a perpetual motion machine take advantage of gravity?
http://en.wikipedia.org/wiki/Perpetual_motion