BELLSET No. 5

A BPO wooden Bellset used with the Telephone No. 4 on CBS No's 1, 2 & 3 systems and Repeater Telephonic No. 9A on CBS No. 1 & Magneto systems.

Fitted with a magneto bell ringer which has two 500ohm coils. There are links (shown as "A" on the diagram) to the left of the bell that can be configured to make the ringer resistance 1000ohms or 250ohms. This Bellset, however, has the bell coils wired in parallel, so as to offer a resistance of 250ohms when supplied.

The Bell ringer is also ready to accept a bias spring. Click here for more information on Bias Springs.

The wooden housing is called a Case No. 1 and could be constructed of American Walnut, Black Chuglam, Pyinma, Halou, Tasmanian Myrtle or African Mahogany.

Introduced circa 1913.

There were three revisions to this Bellset: Mark 234, Mark 235 and Mark 236. The Mark 234 was fitted with a Coil, Induction No.1, whilst the Mark 236 had a Coil, Induction No. 12.

Superseded by the Bellset No. 31 in 1946 for new work, except when used with Telephone No. 1/194.

This Bellset superseded the Bellset, Magneto, P.B.

Bellset includes (1928):-
1 x Bell No. 1A, unmounted.
1 x Bell-gong No. 2, Oxidized.
1 x Bell-gong No. 2A, Oxidized.
1 x Coil, Induction No. 1 (Mark 234) or No. 12 (Mark 236).
1 x Case No. 1.
4 x Screws for fixing.
2 x Washers, Locking, 1-2BA.

Diagram - N505.
Diagram - GEC KS6801 (Mark 326).
Diagram - ETL 25147 (Mark 234).

Drawing - Bellset - 1576 (Mark 236 - Dated 1913).
Drawing - Case - 7276.

Adjustment of Magneto bells

Click here for the difference between a Bell and a Bellset