SINGLE CORD WALL PATTERN SWITCH BOARD
As supplied to the National Telephone Company
For Magneto Ringing only
Consisting of High-resistance Tubular Line Indicators, Corresponding Line
Jacks, Plugs, Cords and Cord Weights. A separate Plug and Cord is provided with
each Switchboard for attachment to the operatorís Telephone.
The Indicators being permanently bridged across the lines serve the purpose of
both Calling and Clearing Indicators. The Terminals are fitted to the Backboard,
and the Case is hinged to allow of easy access to the Terminals and Apparatus.
The Case is made of solid well seasoned Polished Walnut.
Supplied with 5, 8, 10, 16, 20 or 35 lines.
Taken from the GEC Telephone Catalogue, K Section, 10th Edition, 1908