BELLSET No. 5


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

There were three revisions to this Bellset: Mark 234, Mark 235 and Mark 236. 

Superseded by Bellset No. 31 in 1946 for new work, except when used with Telephone No. 1/194.
 

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).
4 x Screws for fixing.
2 x Washers, Locking, 1-2BA.
 

Diagram - N505.

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

Bellset No. 5 internal view - the gongs are black!
Picture dated 1929
With a Coil, Induction No. 12
 
Paster diagram from a GEC produced Bellset
 
Bellset No. 5 Mark 3
With a Coil, Induction No. 12
 
Bellset No. 5 Mark 1 (Picture dated 1906)
With a Coil, Induction No. 1
 

 

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

Last revised: October 13, 2023

FM