TELEPHONE No. 11

OLD STYLE		NEW STYLE (Mark 238)	NEW STYLE

Standard Local Battery wall telephone originally called the "Telephone, Wall, with Magneto Bell and Generator", but was later renamed as the Telephone No. 11 circa 1911.

It was similar to Telephone No. 3 but with the addition of a hand generator.  This was the standard set for Magneto circuits, but could also be used on C.B.S. lines.

It was wooden cased and fitted with a with generator and sloping writing shelf.

There are also numerous differences between the early and new models.

There was a Type 1 and a Type 2 with the Type 1 being the original "Telephone, Wall, with Magneto Bell and Generator" and the Type 2 is fitted with a detachable switch hook (G type or E type).  The Type 1 used a Bell, Receiver A and the Type 2 used a Bell, Receiver B, C or D.

Some early models had a Bell No. 9A, a Generator No. 4 and used the Transmitter No. 2, with a Transmitter-Inset No. 3 fitted.

The later, oblong cased, variant (Mark 238) has a less ornate casing (cheaper to produce) and different gravity switch and generator.  The gravity switch (Switch, Receiver No. 1) is a new design where the contact springs are operated by an ebonite rod.  This ensures that the receiver hook is insulated from the line, in case of a high voltage contact between the overhead telephone wires and external overhead power cables.  The hook also disengages from the gravity switch to allow for transportation and packaging.

The Mark 238 is fitted with a Transmitter No. 6 on early types, then a Transmitter No. 2 (Transmitter, Inset No. 3 fitted) and finally a Transmitter No. 22 on later sets.  If a Transmitter No. 2 was fitted then it would have Label No. 78 fitted between the speaking tube and the transmitter body.  This label advised of the Exchange name and number.

Found in the 1906, 1909, 1910, 1911, 1912, 1913, 1915 and 1928 Rate Books.

Telephone Includes (1906, 1909 and 1910):-
1 x Cord No. 202 or 222.
1 x Transmitter Deckert or Transmitter-Inset.
1 x Induction Coil 25/1 (1906 and 1909) or Coil, Induction No. 1 (1910).
1 x Magneto Bell 1000ohms.
1 x Generator, Bracket 3-terminal.
1 x Generator No. 2.
1 x Bell, Receiver A (1906) or Bell Receiver B, C or D (1909 and 1910).

Telephone Includes (1911, 1912, 1913 and 1915):-
2 x Cords No. 116.
1 x Cord No. 222.
1 x Transmitter No. 3 (1911) or Transmitter No. 2 (1912 onwards).
1 x Coil, Induction No. 1.
1 x Bell No. 9A (1911, 1912 and 1913) or Bell No. 1A (1915 onwards).
1 x Generator No. 4.
1 x Receiver, Bell No. 1.
1 x Label No. 53C (1912) or Card T.E. 114 (1912).

Mark 238 Telephone includes (1928):-
1 x Bell No. 1A, unmounted. (Earlier types had Bell No. 9A).
1 x Coil, Induction No. 1 or No. 12.
4 x Cord, Instrument No. 116.
1 x Cord, Instrument No. 222.
1 x Frame, Notice No. 1. (Earlier types had Frame, Notice, No. 2, and Labels No. 530).
1 x Generator No. 40 (Earlier types had Generator No. 2A).
1 x Glass No. 3.
1 x Hook, Receiver F.
1 x Receiver, Bell No. 1A.
1 x Transmitter No. 2. (Earlier type had Transmitter No. 6).
4 x Fixing screws.

Frames, Notice, No. 2, and Labels No. 53C, were not be maintained in the old type of these instruments.

Telephone included (1946):-
1 x Bell No. 1A, Unmounted.
1 x Guard, Bell Hammer.
1 x Frame, Notice No. 1 (No. 9A for earlier supplies).
1 x Generator No. 4C (No. 2A for earlier supplies).
1 x Plate, Escutcheon, No. 2.
1 x Plate, Escutcheon, No. 7.
1 x each Bell-gongs Nos. 2 & 2A.
1 x Glass No. 3.
1 x Coil, Induction No. 1, or 12.
1 x Hook, Receiver F.
1 x Receiver, Bell No. 1A.
4 x Cords, Instrument No. 1/16E, Black, 12".
4 x Screws for fixing.
1 x Switch, Receiver No. 3.
1 x Cord, Instrument No. 2/22B, Brown, 33".
1 x Arm, Transmitter No. 1.
1 x Transmitter No. 22 (No.2  for earlier supplies).
1 x Desk No. 4, minus backboard.

To be requisitioned separately as required:-
1 x Label No. 78.
1 x Condenser, M.C., No. 102.

The case is held shut by a Lock, Screw No. 1C - renamed as Part No. 3/SLO/17 without spring or 9/SLO/17 with spring.  These fit wooden casings ½" thick.

Made by Ericsson - Model  No's  AB 517 & N20142 (Mark 238 - Dated 1932).

Drawings - 8830, 8831 & 8832 (All Mark 238 and dated 1929).

Drawing for the desk - 7437.

Circuit diagram - N111.

Specification - D150.

Additional good quality pictures of the new style set (Mark 238)

Adjustment of Magneto bells

How to convert to Plug and Socket

See also the Telephone Efficiency Committees Report on Local Battery Area telephones.

Diagram for Mark 238 instrument

Early Telephone No. 11
Note the transmitter arm.  This will move up and down whilst keeping the transmitter parallel to the user
Picture dated circa 1907

Later version, the Mark 238
This is a Telephone No. 3, but the only difference externally with the No. 11 is the addition of a generator handle

Last revised: November 03, 2025