BELLSET No. 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
This Bellset was originally called the "Bellset, Magneto, CB". The early cases had a small key lock on the front door, but this was removed and a spring loaded captive screw fitted to the left hand side of the casing. It was fitted with a 2uf
Capacitor, a 1000 ohm Ringer (comprises of two 500ohm coils) and a two winding Induction Coil
(primary coil is 17ohms and secondary coil is 26ohms). The Bellset was also made in a number of iterations - please see table below. Many were adopted from the sale of the National Telephone Company to the GPO. The wooden casing is called a Case No. 1 and could be constructed of American Walnut, Black Chuglam, Pyinma, Halou, Tasmanian Myrtle or African Mahogany. Bellset No. 1 with Bias Spring, was also available for Telephones No. 76, No. 82 and No. 124. This variant used a "Bell No. 1A, unmounted, with Bias Spring" as the ringing mechanism. Probably marked "BS" on the rear of the case. Click here for more information on Bias Springs. Do not confuse this Bellset with a Bell No. 1A, which has a smaller case and only comprises of a bell ringer and two gongs. This Bellset was universally used by the GPO with table telephones and recovered Bellsets were refurbished and reused. In some cases they were made into wall telephones. By 1946 this Bellset was superseded by Bellset No. 25. Bellset Includes:-
Bellset No. 1 Mark 235
The above was taken from the GPO Rate Book (1928) Wiring Diagrams - LD 38 (Mark NT19), N501 (1919) and N501 (1929). Drawing - Bellset - 1751 (Mark 235). Ericsson made some of these Bellsets, their model N3090. GEC made some of these Bellsets, their model K8175 with diagram numbered KS6724. UK Military number - YA2494. Click here for the difference between a Bell and a
Bellset
Pictures showing Bellset No. 1 with the capacitor (bottom of left hand
picture)
Bellset No. 1 Mark 234
Picture of Bellset No. 1 Mark 235 with Coil Induction No. 18
Early Bellset No. 1 These were probably manufactured at the W.E. factory by B.T.M.C. of Antwerp
Bellset No. 1 with door lock
Bellset No. 1 with door lock
An unusual layout
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Last revised: October 03, 2023FM |