SIEMENS BROTHERS No. 322


Siemens Brother 322
Called an Intermediate set, this is a steel cased table telephone which has an extension telephone connected to it.  It comprises of a dial, hand generator, Bakelite handset, rotating switch and indicator.

This is similar to the No. 332 but the No. 322 also has the additional 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.  The indicator would show when the extension is using the 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).

Click here for an Ericsson article on this telephone

Case removal
The single screw in base releases the base plate.
Remove the hand generator by turning anticlockwise.
Inside base there are two raised brass screws.  Remove both screws to release outer cover.
The outer cover slides away from the base.

EST
The telephone shown below is marked EST and this stands for Egyptian State Telephones.  Similar handsets carry ESR (Egyptian State Railways).  Egypt was a British protectorate at the time, with telecommunications and railways run under British management and technical specification.  This model was also available to the world and UK markets.  Ericsson had a similar if not the same telephone.

Wiring to work
This is not a conventionally wired telephone.  To this end it is recommended that terminals A and B are not connected to a UK exchange line.

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.

An extension can be connected to terminals A and B, marked EXT in the Bellset.


Pictures

Front of telephone showing switch and indicator
 

Centre of handset

 

Base removed exposing terminal strip

 

 

 

 


Circuit wiring diagram
The above diagram also requires a schematic which is not available
 

 
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Last revised: January 07, 2022

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