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In circuit with this battery was placed the secondary circuit of an induction coil, the primary circuit of which contained a telephone transmitter or microphone interrupter.
By the use of a key in the battery circuit as well as an interrupter or current reverser, signals can be given by breaking up the continuous hum in the telephone into long and short periods.
He proposed to employ two large flat coils of wire laid horizontally, on the ground, that on the mainland having in circuit a battery, interrupter and key, and that on the island a telephone.