BELL No. 25A

A bell of 1 ohm resistance.  It operates with a D.C. voltage with the polarity reversed 7 time per second (3.5hz).

Uses two Bell-gong No. 8.

The components are mounted on a mahogany stand and terminals are of the thumbscrew type.  The stand is 12" high by 10" across by 4½" deep.

The bell mechanism has four, 0.25 ohm, windings in series giving a total resistance of 1 ohm for the four coils.

Used in the UK House of Commons as a Division bell in conjunction with a Transmitter, Division Bell (Drawing No. 1378).  As from 1913, bells used external to the Parliamentary estate were standard A.C. bells working at 25hz.

This bell produced a sedate, lazy, ring unlike normal telephone bells and were fitted in ornate wooden enclosures.

Probably introduced around 1904.

Drawing - 90013.

Specification - S3A.

Click here for a description of the UK Division Bell system

Click here for the difference between a Bell and a Bellset

Last revised: July 11, 2023