_Stromberg-Carlson._ Another modification of the central-office
arrangement and also of the subscribers” station circuits, is shown in
Fig. 134, this being a simplified representation of the circuits
commonly employed by the Stromberg-Carlson Telephone Manufacturing
Company. The battery feed at the central office differs only from that
shown in Fig. 132, in that a single battery rather than two batteries
is used, the current being supplied to one of the lines through the
impedance coils _1_ and _2_, and to the other line through the
impedance coils _3_ and _4_; condensers _5_ and _6_ serve conductively
to isolate the two lines. At the subscriber”s station the line circuit
passes through the secondary of an induction coil and the transmitter.
The receiver is kept entirely in a local circuit so that there is no
tendency for direct current to flow through it, but it is receptive to
voice currents through the electromagnetic induction between the
primary and the secondary of the induction coil.

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