BELL No. 48

DC Trembler bell for use outdoors with 6 inch gong (Bell-gong No's 9 or 15).

Operating minimum voltages
Bell No. 48A - 2.5v (25 Ohm coil) - Used for quarterly peg counts.
Bell No. 48B - 20v
Bell No. 48C - 50v
Bell No. 48D - 50v

Bell No. 48C - Trembler bell, similar to Bell No. 48B, for preliminary signal in noisy situations in PO buildings.  Has twin 250 ohm coils and uses Bell-gong No. 19 (cow gong).

Diagram - N648

Bell No. 48B Bell No. 48C


BACK Home page BT/GPO Telephones Search the Site Glossary of Telecom Terminology Quick Find All Telephone Systems

Last revised: December 31, 2021