| Diaphragm No. 2
Made of Aluminium and used on solid
back and C.B. breastplate transmitters.
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| Diaphragm No. 4 Carbon construction of Diameter
1.875".
For Telephone No. 36 and certain Transmitters No. 4.
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| Diaphragm No. 7 For Transmitter No. 4.
Consists of:-
1 x Ferrotype diaphragm, 2.25".
1 x Silk diaphragm.
1 x Cardboard ring.
1 x I.R. band.
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| Diaphragm No. 8 For Deckert transmitters.
Consists of:-
1 x Carbon diaphragm, 2.188"
1 x Paper ring.
1 x Cotton wool ring.
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| Diaphragm No. 9 Stalloy construction of Diameter
2.125".
For Receiver, Bell No. 1A (Mark B), or Receiver, Bell No.
4A, American make.
Superseded by No. 18.
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| Diaphragm No. 12 Stalloy construction of Diameter
2.063".
Standard for Receivers, Bell, Headgear, Watch, and Inset No.
1L (used on Mark 1 Bakelite handsets).
Supersedes No. 17.
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| Diaphragm No. 16 Silk construction.
For breastplate transmitter or Ericsson's micro-telephone.
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| Diaphragm No. 17 Stalloy construction of Diameter
2.072".
For Receivers N.T. Nos. 7, 13 or 14.
Superseded by No, 12.
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| Diaphragm No. 18 Stalloy construction of Diameter
2.110".
Used on:-
Micro-telephones, Hand, N.T. Nos. 1 to 5.
Receivers N.T. No's 1, 2, 3, 5, 6, 8, 9, 12, 15 and 16.
Receivers H.G. No. 1A (Mark N.T. 15) and 4E (Mark 234).
Receivers, Watch No. 1B (Mark N.T. 8 and N.T. 12).
Telephone No. 28 (Mark N.T. 2 and N.T. 3).
Telephone No. 38 (Mark N.T. 5).
Supersedes Diaphragm No. 9.
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| Diaphragm No. 19 Stalloy construction of Diameter
2.140".
For Receivers, Bell, No. 1A (Mark N.T. 10).
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| Diaphragm No. 20 Carbon construction of Diameter
2.219" with 3 slots.
Used on "Glasgow" transmitters and also for Transmitters N.T.
Nos. 16, 17, 18 and 19.
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Diaphragm No. 21
Constructed of tinned iron construction of 1.75" diameter x 5
mils.
Part of Receivers, Headgear No. 5F.
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| Diaphragm No. 22
Ferrotype, gold plated construction of 3.39" diameter.
Used on Telephones No. 83 and 127.
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| Diaphragm No. 23 Stalloy construction of Diameter
2.188".
For Telephone No. 28A.
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| Diaphragm No. 24 Stalloy construction of Diameter 1.875".
Used on Receiver, Headgear No. 1A
(Marks 237 and 238).
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| Diaphragm No. 25 Permandur construction of Diameter 52mm.
Used on Receiver, Inset No. 2P, which are fitted Mark 2
Bakelite handsets.
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