since
their counterparts are not to be found in the system as it really
exists. Here again accuracy has been sacrificed for ease in setting
forth a feature of operation.

Still referring to Fig. 380, it will be seen that the bank contacts
consist of ten rows, each having ten pairs of contacts. Assume again,
for the sake of simplicity, that the exchange under consideration has
one hundred subscribers and that each pair of bank contacts represents
the terminals of one subscriber's line. Assume further that the key
switches in the lower left-hand corner of the figure are being
manipulated by a subscriber at that station and that he wishes to obtain
a connection with line No. 67. By pressing and releasing the left-hand
key six times, he will cause six separate impulses of current to flow
through the upper left-hand magnet and this will cause the switch shaft
to move up six steps and bring the wiper arm opposite the sixth row of
bank contacts. If he now presses and releases his right-hand key seven
times, he will, through the action of the right-hand magnet, rotate the
shaft seven steps, thus bringing the wipers into contact with the
seventh contact of the sixth row and thus into contact with the desired
line. As the wiper contacts on the switch arm form the terminals of the
calling subscriber's line, it will be apparent that the calling
subscriber is now connected through his switch with the line of
subscriber No. 67.

As stated, each of the pairs of bank contacts are connected with the
line of a subscriber; the line, Fig. 380, is shown so connected to the
forty-first pair of contacts, that is to the first contact in the fourth
row. The selecting switch shown in Fig. 380 would be for the sole use of
the subscriber on the line No. 41. Each of the other subscribers would
have a similar switch for his own exclusive use. Since any of the
switches must be capable of reaching line No. 67, for instance, when
moved _up_ six rows and _around_ seven, it follows that the
sixty-seventh pair of contacts in each bank of the entire one hundred
switches must also be connected together and to line No. 67. The same
is, of course, true of all the contacts corresponding to any other
number. Multiple connections are thus involved between the corresponding
contacts of the banks, in much the same way as in the corresponding
jacks in the multiple of a manual switchboard. As a result of this
multiple connection of the bank contacts, any subscribe