Resistance Box

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“When the brass plugs are inserted...the coils are short-circuited, i.e., practically, the whole of a current passing from block to block goes through the plug, but when a plug is withdrawn the current passes through the corresponding coil...By withdrawing the proper plugs, one may throw into the circuit and resistance desired, from a single ohm up to the full capacity of the box.” -Avery 1895


Elroy M. Avery School Physics (New York: Sheldon and Company, 1895) 530


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