Summarized Proceedings for the Period From ... And a Directory of Members As of ... No. 46
Summarized Proceedings for the Period From ... And a Directory of Members As of ... No. 46
American Association for the Advancement of Science
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It was evident that the laws of composition of forces could be considerei I as corollaries of the laws of motion ; so that from the latter a moie comprehensive view of the measurement of force was gained, than from the statical experiments. Thus the statical method of measuring force by balancing the tension of one string or spring against that of another was interpreted dynamically by assuming that the body upon which the springs acted remained at rest in consequence of receiving from the forc...es opposite changes of mo- mentum at the same rate. It followed that if the springs were to act singly, they would, other things being equal, produce equal rates of change of momentum. Thus dynamics furnished a new method of measuring force which agreed with that by means of springs. Further investigation in the light of the new principles showed that the method of measuring forces by weights agreed with the Digitized by Google 166 SECTION 1>. spring measurement and with the dynamical measurement when the condition was observe* 1 that the weights were kept in the same lo- cality, but in general uot otherwise Dynamics gave an explanation of this anomaly by showing that the forces of the weights were due to gravity, which evidently might change in intensity from place to place, although the masses of the weights remained unaltered.
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