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 Introduced in 1947, this Bakelite
cased, combined table handset
telephone was used by the BPO in Automatic exchange areas in
conjunction with a Bellset
No. 41
on shared service separate metering lines.
The case has provision for one press button only and was
supplied with a label stating "Call Exchange".
Mark 1 - has a Receiver, Inset No. 1L in the handset and switch
bracket with plungers of the early type.
Mark 1A - has a Receiver, Inset No. 1L in the handset and switch
bracket with
plungers of an improved type.
Mark 2 - has a Receiver, Inset No. 2P in the handset and switch
bracket with plungers of the early type.
Mark 2A - has a Receiver, Inset No. 2P in the handset and
switch bracket with
plungers of an improved design.
Superseded by the Telephone
No. 312 in 1949.
The wall equivalent is the Telephone No.
311.
Made By Ericsson, model N1003M1
Picture by Paul Follet.
Telephone Includes (1956):-
1 x Bell No. 59A, Unmounted.
1 x Bell-gong No. 2.
1 x Bell-gong No. 2A Nickelled.
1 x Block, Terminal No. 20/8, Black.
1 x Capacitor, M.C. No. 97.
1 x Coil, Induction No. 27.
1 x Cord, Instrument No. 5/14B, Brown.
1 x Cord, Instrument No. 5/28E, 5".
1 x Dial, Automatic No. 12 ...
1 x Key No. 302B.
1 x Part No. 2/SCA/20, Black.
1 x Telephone No. 164, Black.
1 x Tray, D62076 Black.
Diagram for telephone circuit - N410.
Diagram for Button labels - N620.
Drawing No. 63022 - Telephone
components parts.
Drawing No. 63023 - Chassis components.
Drawing No. 63250 - Chassis
components (improved switch hook buttons).
Drawing No. 90319 - Telephone
parts (Mk 3A).
Drawing No. 90373 - Chassis
components (improved switch hook buttons).
Drawing No. SBA12
- 300 type base plate.
Drawing No. 2/SCA17 - 300 type
complete case.
Drawing No. 2/SCA20 - 300 type
case.
Drawing No. 2/SCA47 - 300 type
complete case (improved switch hook buttons).
How to wire your Telephone No. 310
to make it work on Plug and Socket
300 Type
telephone circuit description
Dismantling the Telephone No.
310
Dismantling the Handset
History, Technical and General
Information on 300 type telephones
Collectors information
Adjustment of Magneto bells
Keys for use in 300 type wall and table
telephones
Lamp Fittings
Labels that fit in the sliding tray
General fault finding on your phone
How to restore Bakelite
Comparison chart of GPO 300 type
telephones
Some models were made by British
Ericsson, their model N1003B
Internal View of the
Telephone No. 310
Note the Telephone model number and date between
the bell gongs
Typical 300 type chassis showing dial cord wiring connections
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