 A
metal handset,
with press switch and loop suspension. It is fitted with two plugs, a Plug No. 310
and a Coil and Plug No. 1.Introduced circa 1925, it was a test telephone originally used on Siemens No.
16 Automatic exchanges.
The Telephone No. 140A is used when a Siemens No. 16 exchange is fitted with
Jacks, Test, No 7 & 9. It is fitted with Plug, No. 411.
It is of a similar design to the Telephone No. 80.
Made by ATM their model No. L11286
Circuit diagram - N240.
Drawing - 8577 (dated 1925).
Telephone includes (1928):-
1 x Condenser M.C. No. 83.
1 x Coil and Plug No. 1.
1 x Cord, Instrument No. 122.
1 x Cord, Instrument No. 359.
1 x Diaphragm No. 12.
1 x Earpiece No. 13.
1 x Transmitter, Inset No. 2.
1 x Plug No. 310.
Telephone includes (1946 and 1956):-
1 x Coil and Plug No. 1.
1 x Condenser, M.C. No. 83.
1 x Cord, Instrument No. 1/22F, Black, 72"
1 x Cord, Instrument No. 3/59F, Black, 48" (Telephone No. 140).
1 x Diaphragm No. 12.
1 x Earpiece No. 13.
1 x Plug No. 310B (Telephone No. 140).
1 x Transmitter, Inset No. 1 (No.2 for earlier supplies).
1 x 1 Cord, Instrument No. 3/59F, Black, 48" (Modified to fit Plug No. 411)
(Telephone No. 140A).
1 x Plug No. 411 (instead of Coil and Plug, No. 1, of which the Coil,
Induction, 1000+50 ohms is fixed to back of telephone) (Telephone No. 140A).
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