SIEMENS BROTHERS No. 322
Siemens Brother 322
This is similar to the No. 332 but the No. 322 also has the additional dial, switch and indicator.
The phone was used as a Plan 7 master phone. An extension would be fitted and this would be called by use of the hand generator. A "star" indicator would show when the extension is using the exchange line.
The telephone is connected to a wall mounted Bellset, which also has terminals for connecting to the internal wiring and batteries. The bell in the telephone rings on an incoming exchange line call and the bell in the wall mounted Bellset is used when the extension calls. The wall Bellset has a differently toned bell to differentiate between internal and external calls.
Known as a Corporation set as it is shaped like many similar phones supplied to the large municipalities of the day (i.e. Glasgow Corporation).
The Siemens Dial, Switch No. 18 is the equivalent of the GPO Dial, Automatic No. 10SS.
Wiring to work
This telephone requires a battery for operation. A 4.5 volt battery should be connected to terminals Z (negative) and C (positive) in the Bellset.
For the telephone bell to work the two terminals EB must be linked for the exchange line bell to ring.
The extension telephone is connected to terminals A and B, marked EXT in the Bellset.
Front of telephone showing switch and indicator
Centre of handset
Base removed exposing terminal strip
Circuit wiring diagram
Last revised: January 06, 2023