|AUTOMATIC & C.B.
High-grade reproduction of speech, aesthetic appeal and convenience for maintenance are features of this wall telephone-a compact, robust instrument free of awkward projections and dust-harbouring ornamentation.
Black is the standard colour, but ivory, red or green sets can also be supplied.
The telephone is fixed to the wall through bushed holes in four rubber feet attached to a die-cast back plate on which the internal apparatus is mounted.
The moulded case hooks on to the top of the back plate and is fastened by a captive screw at the bottom. When this screw is released, the case can be lifted and swung down on a suspension, leaving the equipment exposed.
Screw terminals are provided for the external wires, which enter through a hole in the plate. Reliable operation of the cradle-switch springs, with negligible wearing of the parts, is ensured by a highly efficient roller plunger movement.
Standard components of proven efficiency are used throughout, and provision is made in the circuit to reduce side-tone to the minimum. The handset incorporates an inset transmitter and detachable receiver.
For automatic working a standard dial is normally fitted, but dials can be supplied with numbering or impulse ratios to suit customers' requirements.
P.V.C. covered wire is used for the connections. P.V.C. insulated, nylon braided cords can be supplied if specified.
Similar telephones, with 1, 2 or 3 push buttons, are available for operating various extension schemes.
Introduced around 1955.
Taken from the Ericsson catalogue No. 55.
Last revised: October 02, 2019