for special purposes with four way cord. In this telephone the receiver
and transmitter are electrically isolated from each other.
The basic model
is the Telephone No. 184, but there are three other variants, with a built in switch. These models were called Telephone No's. 184A,
184B & 184C.
The switch can be configured in different ways:-
Telephone No. 184A
CB & Auto areas. Pressing switch (non-locking) removes short circuit from transmitter
and allows speech (3 wire).
Telephone No. 184B
LB systems. Pressing switch (locking) completes transmitter circuit (3 wire).
This telephone supersedes Telephone No. 28.
Telephone No. 184C
Supervisors use. Two position locking switch that completes transmitter circuit (4 wire).
Pressure on end of lever near the transmitter makes the transmitter circuit.
Pressure on end of lever near receiver breaks the transmitter circuit. The
telephone supersedes Telephone No. 94.
There was also the Mark 1 and the Mark 2. The difference was that the Mark
1 had a Receiver, Inset, No. 1L whilst the Mark 2 had a Receiver, Inset, No. 2P.
Available in the colours Black, Chinese Red, Ivory and Jade Green.
Telephone includes (1946 and 1956):-
1 x Cord, Instrument No. 4/42A (Colour), 42".
2 x Part No. 1/SWA/72.
1 x Receiver, Inset No. 1L or 2P (Colour).
1 x Mouthpiece No. 15 (Colour).
1 x Transmitter, Inset No. 13
1 x Part No. 1/SB0/1 (Colour).
Circuit diagram N284.
See also the Telephone Efficiency Committees Report
on Local Battery Area telephones
Receivers Inset 1L and 2P
Early handsets were fitted with a Receiver No. 1L but these were
superseded by the Receiver inset 2P. The two are not interchangeable
unless the correct diaphragm and earpiece are used.
Receiver No. 1L with Earpiece No 18 and Diaphragm No. 12
Receiver No. 2P with Earpiece No 23 and Diaphragm No. 25
Remove of the Receiver and Mouthpiece
The Earpiece must be firstly removed by unscrewing anticlockwise. This
will either be very easy or very hard. If the earpiece will not budge
then try the following:-
Ask a friend to have a go - my neighbour is great with
Spray WD40 around the edge, hoping that it penetrate the
thread. Leave a couple of days.
Use a vice and wrap the earcap in a rag or card board -
Place the earpiece in very hot water - hopefully it will
Cover with a rag and tap the earpiece on a hard surface
- this may break the earcap!
Smash it and replace!
removed - slide off the diaphragm - see the picture to the right. Then
you will find two screws - remove the receiver will fall out.
To be honest they do not go wrong often. The normal
problems with them are:-
One of the screws is not tightened down.
Ingress of water rusting the internals.
Rust on the pole faces.
The mouthpiece is located on three lugs, one of which is sprung loaded.
The mouthpiece has a hole which can be located on the handle side of the
To remove, use a drawing pin and push into the hole under
pressure. This pushes one of the metal lug inwards and allows the
mouthpiece to be unscrewed anticlockwise.
The Microphone Inset will drop out exposing the screw
terminals for the handset cord.