TELEPHONE No. 44


Telephone No. 44 Mark 1	Telephone No. 44B

PORTABLE LINESMAN'S TELEPHONE
This portable telephone was used in manual exchange areas on C.B. and L.B. circuits and originally had no provision for a dial. It is fitted with a bell and encased in leather.

Previously called the "Telephone, Portable, Complete, Type 2" but later renamed as the Telephone No. 44 circa 1911.

The Telephone No. 44 Mark 1 has a generator and bell but no dial.

Telephone No. 44A is similar to the Mark 1 but is fitted additionally with a DC buzzer (Buzzer No. 2A) and a buzzer calling button.

Telephone No. 44B was for use in Automatic exchange areas and is fitted with a dial. No buzzer is fitted in this telephone.

Telephone No. 44C was used in C.B. areas and has a bell, DC buzzer, a buzzer calling switch and a Pressel speaking switch. The handset key must be operated during dialling and speaking.

All the variants have two terminals on the case, labelled: L1 and L2 except for the No. 44C which has three terminals, labelled: L, B and E.

There are two brass rings on the top of the case. One was to secure the handset cord and the other was used in conjunction with a metal clip to secure the ringing generator handle.

The generator is different from most as it contains the bell ringer coils and the bell gong is also part of the generator.

The telephone is equipped with an extensible handset, known as a Telephone No. 84 or Telephone No. 36 (shown to the right in a collapsed state), the whole item fitted into a leather carrying case. This handset has a switch within the body. Only the Mark N.T. 4 uses the Telephone No. 84.

Originally used by the national Telephone Company (NTC), the non-dial version came as a Mark N.T. No. 3 (fitted with a Telephone No. 36) or a Mark N.T. No. 4 (fitted with a Telephone No. 84). The NTC No. 4 also had a press button fitted to the case.

Supersedes the "Instruments, Test, N.T. No's 3 and 4".

These were superseded by the Telephone No. 250.

Made by British Ericsson - their CB Model No. N1830 and Automatic Model No. N1831.

These phones can be found in the GPO Stores Catalogue 1910, 1911, 1912, 1913, 1914, 1915, 1928 and 1946.

Telephones includes:-
Telephone No. 44 (1928)
Please refer to table below:-

Item	Mark 234 and Mark N.T. 3	Mark N.T. 4	No. 44A	No. 44B	No. 44C
Case, Leather, for Telephone No. 44	1	1	1	1	1
Coil. Induction No. 10	1	1	1	1	1
Condenser, M.C. No. 16	1	1	1	1	1
Generator, Special (500ohms)	1	1	1	1	1
Handle, Generator No. 11	1	1	1	1	1
Telephone No. 36	1	-	1	1	1
Telephone No. 84	-	1	-	-	-
Dial	-	-	-	1	-
Bell	1	1	1	1	1
Buzzer No. 2A	-	1	1	-	1
Battery Dry No. 8	-	-	-	1	-
Battery, Dry, P	1	1	1	-	1

Telephone No. 44B (1928)
1 x Case, Leather, for Telephone No. 44B.
1 x Mounting, Dial, Automatic No. 3.
Other parts as for No. 44.

To be requisitioned separately:-
1 x Cord, instrument, No. 339 or No. 358.
1 x Dial, Automatic No. 1, No. 3, No. 6, No. 8, or No. 10.

Telephone No. 44A (1946 and 1956)
1 x Case, Leather, for Telephone No 44.
1 x Condenser, M.C. No. 16.
1 x Handle, Generator No. 11.
1 x Coil, Induction No. 10.
1 x Buzzer No. 2.
1 x Telephone No. 36.

To be requisitioned separately:-
1 x Battery, Dry No. 8 (3 volts).

Telephone No. 44B (1946 and 1956)
1 x Case, Leather, for Telephone No. 44B.
1 x Mounting, Dial, Automatic No. 3.
1 x Cord, Instrument No. 3/58E, 2.5".
Other parts as for No. 44.

To be requisitioned separately:-
1 x Dial, Automatic No's 1, 3, 6, 8 or 10.

Circuit Diagram - N144 (Mark 1))
Circuit Diagram - N144 (Telephone No. 44 Mark N.T. 4 and 44A)
Circuit Diagram - EC1139 (Telephone No. 44A)
Circuit Diagram - A.T. 735 (Telephone No. 44B)
Circuit Diagram - Telephone No. 44C
Circuit Diagram - TL445 (Instrument Test N.T. 3)
Circuit Diagram - NT10230 (Mark N.T. 4)

Additional Pictures