Automatic Telephones

n1070.jpg (7945 bytes)The caseworks of this instrument is made of moulded black Bakelite which is easy to keep clean and does not become shabby through long usage.  The micro-telephones are fitted with detachable receivers and "inset" transmitters.  The ringers (1000 ohms) are fitted inside and apertures are arranged to permit clear audibility of ring.

This wall instrument follows the design of the table set immediately above.

The case is hinged at the bottom to a metal back upon which are mounted the induction coil, ringer, switch, condenser and terminals.  The whole interior is exposed by undoing one screw only, and the apparatus can be removed as a unit without taking the instrument from the wall.

Dimensions 8.5 x 9.25 x 4.25  inches

Weight 6.25 lb.

Taken from the Ericsson Telephone Catalogue, edition No. 26, Supplement 1935

Diagram N19927 is dated 1935.
Diagram N19927/4 was found in an N1070T.

Click here for an article in the Ericsson Bulletin

Handset Connections

  1. White of Handset cord to terminal 2.
  2. Red of Handset cord to terminal 4.
  3. Green of Handset cord to terminal 6.

Converting to UK Plug and Socket system

  1. Remove existing line cord.
  2. Remove the metal link between terminals 5 and 7.
  3. Connect a 3.3K resistor between terminals 5 and 7.
  4. Connect white of the new line cord to terminal 3.
  5. Connect red of the new line cord to terminal 1.
  6. Because of the way this telephone is wired the green and blue wires of the line cord are not used and should be insulated with plastic tape.
  7. Rectifier element to be fitted between terminals 4 and 6.

n1070.jpg (7945 bytes)



n1070.jpg (7945 bytes)



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Last revised: July 23, 2023