TELEPHONE No. 5

Wall mounted wooden cased telephone with switchable extension facility, used in C.B. areas as the main telephone.

This telephone was previously known as the "Telephone, Wall, C.B. Intermediate with Generator" and later renamed as the Telephone No. 5 circa 1911.

A later variant was introduced where an Intermediate Switch 4-way (Key, Type 2077) takes the place of the 3-way Switch in the older form, and the title also includes a Coil, Retardation, 400ohms, Type 2010 F.

This arrangement permits an additional "position" being utilised: "Main Set through to Extension, Exchange held."

Used in conjunction with a Telephone No. 7, giving intercommunication between the two, this set was the main instrument.  This telephone can be secret or non-secret, dependent on the position of two sets of links.

This telephone has three Capacitors, an Induction Coil, a 4 way switch, an indicator and two bell ringers, one being 1000ohms and the other 50ohms.

One bell was for incoming exchange calls with the other bell used when the extension called.

Found in the 1906, 1909, 1910, 1911, 1912 and 1913 Rate Books.

The 1915 Rate Book shows the telephone made obsolescent.

Probably based on the BTMC No. 2563.

Telephone includes (1909, 1910, 1911, 1912 and 1913):-
1 x Hook, Receiver F.
1 x Switch, Receiver No. 2.
1 x Intermediate, Switch, 4 way (Key Type 2077).
1 x Coil, Induction.
1 x Coil, Retardation 400ohms, type 2010F.
1 x Bell No. 4A.
1 x Bell No. 1A, Unmounted.
1 x Condenser, M.C. 0.5uf.
1 x Condenser, M.C. 2uf.
1 x Condenser, M.C. 10uf.
1 x Siemens Brothers Transmitter C.B (1906 to 1910) or Transmitter No. 1 (1911 onwards).
2 x Cord, Flexible No. 116.
1 x Cord, Flexible No. 222.
1 x Bell, Receiver B, C or D (1909 to 1910) or Receiver, Bell No. 1 (1911 onwards).
1 x Generator.

Circuit diagram - N105.

Circuit Diagram - CB141.

Last revised: January 18, 2026