iple jacks and also an additional equipment of answering jacks and
lamps.

[Illustration: A MULTIPLE MANUAL SWITCHING BOARD FOR TOLL CONNECTIONS IN
AN AUTOMATIC SYSTEM Multiple Jacks are Provided for Each Line through
Which Toll Connections are Handled Directly.]

[Illustration: Fig. 370. Small Multiple Board Section]

For ordinary local service no operator would sit at the left-hand
position of the section shown, that being the end position, since the
operator there would not be able easily to reach the extreme right-hand
portion of the third position and would have nothing to reach at her
left. This end position in this particular board illustrated is provided
with toll-line equipment, a practice not uncommon in small multiple
boards. To prevent confusion let us assume that the multiple jack space
contains its full equipment of 3,000 jacks on each section. The
operator in the center position of the section shown could easily reach
any one of the jacks on that section. The operator at the third position
could reach any jack on the second and third position of her section,
but could not well reach multiple jacks in the first position. She
would, however, have a duplicate of the multiple jacks in this first
position in the section at her right, _i. e._, in the fourth position,
and it makes no difference on what portion of the switchboard she plugs
into the multiple so long as she plugs into a jack of the right line.

CHAPTER XXVII

TRUNKING IN MULTI-OFFICE SYSTEMS

It has been stated that a single exchange may involve a number of
offices, in which case it is termed a multi-office exchange. In a
multi-office exchange, switchboards are necessary at each office in
which the subscribers' lines of the corresponding office district
terminate. Means for intercommunication between the subscribers in one
office and those in any other office are afforded by inter-office trunks
extended between each office and each of the other offices.

If the character of the community is such that each of the offices has
so few lines as to make the simple switchboard suffice for its local
connections, then the trunking between the offices may be carried out in
exactly the same way as explained between the various simple
switchboards in a transfer system, the only difference being that the
trunks are long enough to reach from one office to another instead of
being short and entirely local to a single office. Such a condition of
af