MACHINES, PULSING AND RINGING
These are motorised ringing machines used generally in UAX No. 13 telephone exchanges.

E.I. Power, Machines and Switchboards C1210 - Identification of carbon brushes.
E.I. Power, Machines and Switchboards C5511 - Parts for exchange staff.
E.I. Power, Machines and Switchboards C5512 - Parts for regional workshop staff.
E.I. Tests and Inspections, Routine P5600 - Routine Maintenance

Click on any picture to enlarge

Machine, Pulsing and Ringing No. 1, 1A and 1B

The machine was of the dynamotor or rotary converter type having a two pole field energized either electrically, or by permanent magnet.  It was powered from a 50 volt d.c. supply.

Drawing - CD1205 (No. 1) and CD1068 (No's 1A and 1B).

Diagram - AT5445 (No. 1) and AT5334 (No's 1A and 1B).

Specification - T4203 (No. 1) and T4196 (No's 1A and 1B).
 
 
Walter Jones
Machine, Pulsing and Ringing No. 2A

The machine was of the dynamotor or rotary converter type having a two pole field energized either electrically, or by permanent magnet.  It was powered from a 50 volt d.c. supply.

For use when a one second metering cycle is required.  Otherwise as for No 1

Drawing - CD1696.

Diagram - AT60131.

Specification - T60131.

Newton Brothers Brush size - 5.9mm x5.9mm x 21mm with an overall length of  about 40mm including the spring.

 
Newton Brothers


Walter Jones
Machine, Pulsing and Ringing No. 3A

The machine was of the dynamotor or rotary converter type having a two pole field energized either electrically, or by permanent magnet.  It was powered from a 50 volt d.c. supply.

Drawing - CD1753.

Diagram - 60199.

Specification - T60199.
 
 		  


BACK Home page BT/GPO Telephones Search the Site Glossary of Telecom Terminology Quick Find All Telephone Systems
Last revised: August 23, 2026
FM