To avoid complication in the
drawings, however, the simplest case is taken. And it must be
understood that instead of the single instrument shown at T1 or T2, a
complete set of telephonic instruments, including transmitter,
battery, induction-coil, and receiver or receivers, may be
substituted. And if a shunt, S, of 500 ohms placed across the circuit
makes no difference to the talking in the telephones because of the
interposition of the separating condenser, C, it will readily be
understood that a telegraphic system properly "graduated," and having
also a resistance of 500 ohms, will not affect the telephones if
interposed in the place of S. This arrangement is shown in Fig. 3,
where the "graduated" telegraph-set from Fig. 1 is intercalated into
the telephonic system of Fig. 2, so that both work simultaneously, but
independently, through a single line. The combined system at each end
of the line will then consist of the telephone-set, T1, the telegraph
instruments (comprising battery, B1, key, M1 and Morse receiver, R1),
the "graduating" electromagnets, E1, and E2, the "graduating"
condenser, C1, and the "separating" condenser, C2.
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