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SCIENCE. as the Thompson electrical balance; but. the latter is an expensive instrument, beyond the reach of the ordinary electrical engineer, and is not readily portable. Professor Ryan's invention, consisting of a method of suspension and the laying-off of a scale, renders the construction of the apparatus a matter of a few hours' labor by any fair mechanic. As in the Thompson balance, the current passes through two parallel fixed coils, and through a coil swinging between them. In thedoi:10.1126/science.ns-14.352.295-c pmid:17841283 fatcat:h4hk23dqezapzbs57ch2gk2fjy