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motive force against the fall of potential in the resistance to be determined. It has, however, a very serious limitation in the very small electromotive force generated, and in the appreciable thermoelectric forces produced at the sliding contacts. And if one were to attempt to get a tenfold greater precision than has hitherto been obtained in absolute resistance measurements by this method, it would probably be found that these sliding contact troubles would be very serious.doi:10.6028/bulletin.121 fatcat:qlkzvxfkinhfdjm7qglsi5qyui