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