MODIFIED BRIDGE METHOD FOR ABSOLUTE DETERMINATION OF OHM
Marcin Romanowski · Canadian Journal of Physics · 1952
The principal characteristics of Campbell's original bridge for the determination of the ohm (in terms of mutual inductance and time) and of Picard's modification to the bridge are examined. Two other networks for the same measurement are found possible by rearranging components. One arrangement in particular offers advantages over previous methods and was built in an experimental form. In it all important circuit elements are constructed of manganin, rendering the bridge less subject to temperature effects, and no determination of self-inductance is necessary. The new bridge does require a mutual inductance equal to twice the value of the standard. A brief outline of the method for resolving this point is given as part of a more general work under way on the scale of inductance.