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The Resistance Box
Resistance Boxes were used to put known values of resistance into circuits. They came in several different, but equivalent formats.
Photo of resistance box
Sound recording explaining that with no plugs in the box the current flows through the resistance coils. Each plug inserted shorts the terminals of the coil thus removing it from the circuit. When a current flows through the coil the double winding creates two equal and opposite magnetic fields which cancel each other out in this way the coil acts as pure resistance with no inductance.
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