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We can hear everything ourselves, but we cannot be
overheard. He knows nothing. You see, I took advantage of the fact
that additional telephones or so-called phantom lines can be
superposed on existing physical lines. It is possible to obtain a
third circuit from two similar metallic circuits by using for each
side of this third circuit the two wires of each of the other
circuits in multiple. All three circuits are independent, too.
"The third telephone current enters the wires of the first
circuit, as it were, and returns along the wires of the second
circuit. There are several ways of doing it. One is to use
retardation or choke-coils bridged across the two metallic
circuits at both ends, with taps taken from the middle points of
each. But the more desirable method is the one you saw me install
this afternoon. I introduced repeating-coils into the circuits at
both ends. Technically, the third circuit is then taken off from
the mid-points of the secondaries or line windings of these
repeating coils.


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