The mirror., 1923-11-29

other electrical disturbances by small
carbon blocks are insulated from each
other with a piece of mica. When light
ming comes in over the wire it breaks
down this insulation and burns out the coil
quite frequently and is carried harmlessly
to ground.
From the main frame the lines go to
the intermediate distributing frame. Here
they are connected to the multiple jacks
and answering jacks, which terminate in
front of each operator at the switch board.
They are also linked with an auxiliary
signal circuit at this point. The signal
circuit consists of line relay and cut off
relay. The relay is connected with the
signal lamp in front of the operator, so
that when the receiver is lifted from the
hook, the relay is magnetized causing a
small armature to operate. This operation
in turn lights the lamp in front of ,he
operator notifying her that subscriber
wants number.
The multiple jacks are so arranged that
each operator can reach every subscriber
in her local exchange without inconven-
ience. Answering jacks are also easily
accessible, there being from seventy to
one hundred signals and answering jacks
to each operator.
The Switch Board operator has her own
position at the board. There are seventeen
sets of cords arranged in pairs at each
position. One is the answering cord, which
she inserts in response to call in the
answering jack. The other is the calling
cord which is inserted in the multiple jack,
with which she can ring the subscriber
called for by means of small kew. Her
operating set consists of watch case
receiver held in place with head band.
A transmitter fitted conveniently in the
proper place leaving her hands free to
complete all necessary connections.
From the local operators switch board
the lines are brought over to the Trunking
Board, in multiple jacks placed in front
of the Trunk operator. The purpose of
this switch board is to make connections
between the various exchanges. Such as
making connection from one subscriber
in the southern part of large city, with
another in the northern part. Each sub
scriber's line coming into different Office.
By pressing button the local operator
can communicate with the Trunk operator,
who in turn communicates with the opera
tor at the distant exchange with which
connection is desired.
When conversation has been concluded
and the two communicates have replaced
their receivers, two small lights will ap-
pear in front of the operator, thereby
notifying her that they are through talk
ing. On the appearance of the disconnect
signal she removes the cords from the sub
scriber answering and multiple jacks.
This leaves the lines clear for immediate
future use.
In the same room where the switch
board is located is usually the chief opera
tors desk 1t is arranged for the necessary
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she can listen in on her operators, there
by assisting in the maintenance of service.
= The Wire Chiefs desk or test board is
so arranged that line can be tested in
short time. The person testing can tell
just about where the trouble is, thereby
saving a lot of time. For instance he can
ascertain whether the trouble is in the
Office or the distance away from it. In
cold weather the outside repair man sure
appreciates the accuracy of good tester.
In the electrical world this system is
known as the Common Battery system. 1t
is used by the "Bell SYSTEM" throughout
this country.
The spirit among the employees is that
whatever else may fail, the telephone SER
vice must not fail, if human effort can
prevent it. In connection with that the
idea of One Policy, One System, Univer-
sal Service, and all directed toward Better
Service, sure gives us telephone organi-
zation UNSURPASSED.