GEC No. 2000 Series
Although comparatively inexpensive this type of switchboard, which is available in a number of sizes, is of the same high quality throughout as those employed in the largest magneto systems. Simplicity is obtained by dispensing with cord circuit keys and effecting each through connection by means of a single cord.
The case is of matt polished walnut and the front portion, carrying the indicators and jacks, is hinged to give easy access to the wiring and line terminals. The latter are well spaced and clearly marked to facilitate connection of the line wires and are so arranged that when earth return circuits are employed, i.e. single lines to each instrument, the necessary common strap may readily he fitted.
The 100 ohm drop indicators serve as both calling and clearing signals, one of the two in each completed connection being left in circuit for "ring off" purposes. The switchboard includes no operator's set and is designed to employ an ordinary series type magneto telephone, the operator connecting the instrument to any desired line by means of a single-ended service cord provided on the board.
In order to prevent delay if the operator fails to notice a calling or clearing signal, an alarm bell is fitted, the circuit of which is completed through contacts operated by the drop indicators. A switch is provided to enable the hell to be disconnected if desired.
Any of the series circuit magneto telephones listed in this catalogue are suitable for use as extension instruments with switchboards of the No. 2000 Series.
Cat. No. 2008 is shown pictured above.
Taken from the GEC Telephones and Switchboards (Manual and Automatic) Catalogue No. 11 (Circa 1936)
Last revised: July 30, 2012