WITH SPECIAL PROTECTIONS AGAINST HIGH-TENSION CURRENTS No. 444
This instrument is used in places where the telephone wires are run on the same poles as lines carrying high-tension currents. It should be fixed high up on the wall as near the ceiling as possible. The receiver and transmitter are fitted at the end of India rubber tubes, so that the users are thoroughly protected against any danger arising from the high-tension currents. The automatic switch of the instrument is worked by a pulley fixed to a cord, In the ringing position the pulley is secured oil a hook. There are also special arrangements for working the generator.
Weight 30.70 lbs.
Price £9 5s.
Last revised: October 01, 2019