The physician Golding Bird designed his own interrupter circuit for delivering shocks to patients from a voltaic cell through an induction coil.
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A modified version of the interrupter was produced by Henry Letheby which could output only the make, or only the break currents by a mechanism consisting of two spoked wheels.
Callan's induction coil also used an interrupter that consisted of a rocking wire that repeatedly dipped into a small cup of mercury (similar to the interrupters used by Charles Page).