Excerpt from A Dictionary of Electrical Words, Terms and Phrases, Vol. 2: T to Z
Since, when either key is moving there is a small interval of time when the circuit is broken for incoming currents, the keys are generally made so as to close the second contact before breaking ... the first.
In order to avoid disturbing the balance on the introduction of the resistance of the batteries at A or B, on closing the circuits, an equal resistance is added at r and r', between the back stop and the earth.
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