Western Electric Catalogue #1 - Wedophones.com wedophones

7 6 WESTERN ELECTRIC COMPANY
No. 9 SWITCHBOARD
No . 2 Chief Operator's Desk
DESKS
The necessary desks, such as Wire Chief's,
Chief Operator's, \tanager's and Information
Desks, will be provided with the multiple
switchboard .
POWER PLANT
The power plant is laid out on the basis of
24 volt battery supply for local connections
No . 9 Wire Chief's Desk and 48 volt supply for toll and long distance
connections . For charging the storage batteries,
it is considered desirable to have duplicate
sources of power and the usual arrangement is to have two charging sets entirelyindependent of each other,
one to operate from the city power supply and the other run from a gas engine installed at the exchange,
the latter is to be used as an emergency set in case of accidents, or abreakdown in the city plant .
To provide ringing current, duplicate ringing machines are ordinarily furnished, one run from the
storage battery and the other from the city power supply . These sets may be equipped with
interrupters for tone, trouble and busy test service .
The No . 9 switchboard is used in offices up to 800 lines capacity . Two types of this board are furnished,
one for use in offices to handle only local and toll traffic and theother in offices such as those in the vicinity
of large telephone centers, where calls will be trunked to other exchanges . These are known as the No . 9-D
and No . 9-C switchboards respectively, and differ principally in that the No . 9-D is arranged for 24 and
the No. 9-C for 38 volt battery supply .
These switchboards are furnished with magnetic line and supervisory signals, and are arranged for
negative supervision .
The cord circuits on the subscriber section are equipped with condensers, and those on the toll sections
with repeating coils . The toll cord circuits are universal, i.e ., they are entirely automatic, being arranged
so that either toll to toll or toll to local connections can be made without anyadditional work by the operator,
no keys or switching devices, other than the regular listening and ringing keys, being necessary .
The board is self-contained, terminal strips and connecting rack being mounted on the rear to provide
for cross-connecting the multiple jacks and line signals .
This section is a two-panel single operator's section with a capacity for 400 multiple jacks and 200 line
signals . The lines are n:ultipled every second section, making a total multiple capacity of 800 lines .
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