y be inferred that perpetual] motion isa ted problem of the perpetual motion, thing absolutely impossible, when only such bodies are em- from day to day precisely to the extent required without In short, a perpetual motion would be, for example, a watch causing any unnecessary pressure upon the… … ployed as are not acted on by motive power, orany heavy body ; for, as these passive forces, which cannot be avoided, are con- stantly resisting, it is evident that the movement must con- tinally abate; and, from what has been said, it will be seen that, when bodies are not acted on by any niotive…
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