Magneto Wall Telephones
|N2505, N2507 or N2508||N2509 or N2513|
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.
All terminals are enclosed.
Polarised ringer, see table.
Powerful generator, see table.
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.
Micro-telephone cord N4024
Micro-telephone cord N4021
Receiver diaphragm N4401
|Code No.||Circuit description||Generator Magnets||Ringer ohms||Dimensions ins.||Weight lbs.|
|N2504||Magneto, mining||16.5 x 10.5 x 10.5||18|
|N2505||Standard bridging||4||1000||16.5 x 10.5 x 10.5||18|
|N2507||Heavy bridging||5||2000||16.5 x 10.5 x 10.5||18.75|
|N2508||Magneto, railway||5||2000||16.5 x 10.5 x 10.5||18.75|
|N2509||Standard bridging||4||1000||16.5 x 10.5 x 10.5||18|
|N2510||Heavy bridging||5||2000||16.5 x 10.5 x 10.5||18.75|
|N2511||5||2500||16.5 x 10.5 x 10.5||16.25|
|N2512||6||2500||16.5 x 10.5 x 10.5||19|
|N2513||High Tension cct use||5||2000||16.5 x 10.5 x 10.5||17.25|
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.
Taken from the Ericsson Telephone Catalogue, edition No. 26, supplement 1932
|N2504 - pre 1930's model||N2504 - 1930's model|
Click here for an article from the Ericsson Bulletin
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