of wooden construction, used with:-
- For C.B.S. No. 2 and 3 systems: with Telephone,
No. 4. Diagram C.B.S. 590.
- For very long lines on automatic systems: with
Telephone, No. 134. Diagram A.T. 788.
- For magneto "condensered" systems: with Telephone, No. 4 and
Generator No. 3AN, or No.
4CN, or No. 8AN. Diagram C.B.S. 590.
- Repeater, Telephonic No. 9A on CBS No's 2 & 3 and Magneto systems.
Made by Ericsson - their Model No. N3092A.
Superseded by Bellset No. 31 by 1946.
Bellset includes (1928):-
1 x Bell, No. 1A, unmounted.
1 x Coil, induction, No. 12.
1 x Condenser, M.C. No. 30 (prior to 1932).
1 x Condenser, M.C. 102 (1932 onwards).
Circuit diagram - N515.
Adjustment of Magneto bells