PRIVATE MANUAL BRANCH EXCHANGES
Switchboard CB 873
Red telephone box
GPO
General Post Office
Made by British Ericsson
Internal office telephone system
Restoration project
Wooden
1940’s
Rotary dial
Office
General
This Instruction describes Switchboard CB 873 which is a floor-type double-cord with an ultimate capacity of 25 lines. The Switchboard is suitable for use in either C.B. (manual) or automatic. The wiring of the switchboard is complete for 5 exchange lines, 20 extension circuits and 8 cord circuits, with provision for a maximum of 10 cord circuits.
The 1928 Rate Book and 1939 instruction advised that an earlier Switchboard was available that was equipped with 3 exchange lines, 10 extension circuits and 5 cord circuits, with provision for a maximum of 5 exchange lines, 20 extensions and 10 cord circuits. Diagram CB 874 was initially dated 1914 and described two switchboards with the maximum capacity of 25 but supplied to the field as 3+10 and 5+20.
Dimensions and weights
Height - 4ft 3ins.
Width - 1ft 7ins.
Depth - 1ft 8ins.
Weight (3+10 (25) - 135 lbs.
Weight (5+20 (25) - 164 lbs.
Heavy item
Collection only
Sold as seen
Carlton Service Station
Carlton Miniott
Thirsk
North Yorkshire
YO7 4NJ
Contact Richard 07817 516828