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Perpetual motion machine (view source)
Revision as of 23:17, January 1, 2007
, 23:17, January 1, 2007no edit summary
This is not the usual meaning of the term "perpetual motion."
This is not the usual meaning of the term "perpetual motion."
:The perpetual motion, then, which has been the subject of such anxious and laborious search, is not a mere motion which is continued indefinitely. If it were, the diurnal and annual motion of the earth, and the corresponding motions of the other planets and satellites in the solar system, as well as the rotation of the sun upon its axis, would be all perpetual motions.
:The perpetual motion, then, which has been the subject of such anxious and laborious search, is not a mere motion which is continued indefinitely. If it were, the diurnal and annual motion of the earth, and the corresponding motions of the other planets and satellites in the solar system, as well as the rotation of the sun upon its axis, would be all perpetual motions....
:In short, a perpetual motion would be a watch or clock which would go for so long as its mechanism would endure without being wound up: it would be a mill which could grind corn or work machinery without the action upon it of water, wind, steam, animal power, or any other moving force external to it.
::—Dionysis Lardner, 1857, ''Natural Philosophy for Schools,'' [http://books.google.com/books?vid=OCLC34136808&id=ZzsDAAAAQAAJ&pg=RA1-PA70&lpg=RA1-PA70&dq=%22perpetual+motion%22&as_brr=1 p. 70]
::—Dionysis Lardner, 1857, ''Natural Philosophy for Schools,'' [http://books.google.com/books?vid=OCLC34136808&id=ZzsDAAAAQAAJ&pg=RA1-PA70&lpg=RA1-PA70&dq=%22perpetual+motion%22&as_brr=1 p. 70]
:But by "perpetual motion" is generally meant a machine which will do work and keep going though energy equivalent to the work done is not supplied to it. Many attempts have been made to construct such a machine. They have all failed. The statement that energy cannot be created denies the possibility of such a machine.
:But by "perpetual motion" is generally meant a machine which will do work and keep going though energy equivalent to the work done is not supplied to it. Many attempts have been made to construct such a machine. They have all failed. The statement that energy cannot be created denies the possibility of such a machine.
::—S. Lawrence Bigelow (1912), "Theoretical and Physical Chemistry," [Theoretical and Physical Chemistry By S Lawrence Bigelow p. 26]
::—S. Lawrence Bigelow (1912), "Theoretical and Physical Chemistry," [http://books.google.com/books?vid=OCLC01829380&id=Xo8AAAAAMAAJ&pg=RA1-PA26&lpg=RA1-PA26&dq=%22perpetual+motion%22&as_brr=1 Theoretical and Physical Chemistry By S Lawrence Bigelow p. 26]