ERICSSON
TELEPHONE No's N1170 & N1172
 
Battery Ringing Wall Telephones
for Railway Work
n1170.jpg (8091 bytes) n1172.jpg (24622 bytes)
N1170 N1172

The battery ringing type of telephone is preferred by most railway companies, so that these instruments are specially designed for simplicity, efficiency and durability in such service.

This set is very suitable for long lines and short lines where the insulation is low.

It is fitted with a relay which operates with weak currents and automatically connects a local circuit for ringing the bell.

Separate speaking and ringing battery circuits.

Double pole "Bell" receiver N6801
Receiver cord N4060
Solid back transmitter N7701
Bell: 100 ohms
Relay: 1000 ohms
Induction coil
Enclosed terminals
Press-button for signalling
Carbon lightning arrester

Overall dimensions 12 x 7.25 x 6.75 inches
Weight 7.25 lb.

Click here for Blueprint picture of N1170C

Click here for more information

Introduced circa 1932.

These phones were in use on the L.N.E.R Eastern Area in 1934.

These telephones require a power source for the transmitter.  Batteries were used and these would have been 3 volts and connected to MC (positive) and MZ (negative).

These telephones cannot be connected to your normal exchange line as the bell will not ring and the transmitter requires batteries.  However two N1170 telephones can be used as an intercom but will require batteries.

To connect two N1170 telephones together as an intercom follow these instructions:-

  1. Each telephone uses three 3 volt batteries.  These can be made up connecting two 1.5 volt batteries in series.  U2 batteries in a holder will be best for each 3 volt battery but smaller batteries will work, giving much reduced life.

  2. One 3 volt battery connects to Z and C with the positive on C.

  3. One 3 volt battery connects to C and LZ with the positive on C.

  4. One 3 volt battery connects to MZ and MC with the positive on MC.

  5. Connect L1 of one telephone to L1 of the other.
  6. Connect L2 of one telephone to L2 of the other.

To operate
Press the button to ring the distant phone and then pick up the handset.

 
 
Home page BT/GPO Telephones Ericsson Telephones Ericsson Home Page Ericsson PABX All Telephone Systems

Last revised: April 02, 2025

FM2