CORDLESS, PRIVATE BRANCH EXCHANGES
N 140A shown pictured to the right.
These switchboards are very compact and are designed to be placed on a table or shelf.
They are for use as private branch exchanges in connection with the larger C.B. and automatic public exchanges, when for the latter a dial is fitted.
They can also be supplied without exchange lines for private installations.
The woodwork is matt polished and the metal fittings are finished in black and copper bronze.
All connections are made by means of keys. Broad lines of colour extending across the key mountings indicate clearly the different connecting circuits and simplify operating procedure.
The extension lines are fitted with self-restoring disc indicators N4754M, which also act to give positive supervision. The exchange line indicators N4780 are similar, but are restored by means of push-buttons.
A hand generator is provided for calling the extension telephones and a buzzer gives an alarm when any indicator is actuated.
A special feature of these and our larger Branch Exchange Switchboards is the totally enclosed indicators which prevent damage by operators and also render the boards dust-proof.
For operating purposes a Bakelite micro-telephone is supplied.
Note - Standard British Post Office Switchboards can be supplied if desired, also
larger sizes can be provided on application.
Last revised: October 12, 2019