|Magneto Wall Telephones
Robust and powerful instruments of the same design except that N2509 and N2510 (shown below) are fitted with the moulded Bakelite type of micro-telephone.
The casework is of polished oak with the external metal fittings finished black and
copper bronze and the internal metal fittings, dull nickel plate.
Battery compartment for 2 cells each having overall dimensions of 3.9 x 3.9 x 7.5 inches.
The wiring is so arranged that a condenser may be readily added in the ringer or receiver circuit as desired.
For central battery signalling systems, instruments similar to the above but without generator can be supplied.
N2504 is a mining telephone that is only approved for surface use (pictured below).
N2508 has a push button on the front used for railway code signalling .
N2504 - N2510 introduced around 1932. N2511 introduced around 1935.
N2510T had terminals mounted on ebonite.
Taken from the Ericsson Telephone Catalogue, edition No. 26, supplement 1932
Diagram N16143 is dated 1932.
Last revised: June 22, 2020