Each telephone incorporates its own selecting and calling equipment, the system being interconnected by multi-wire cable.  The telephones are designed for use either as wall or table sets, the necessary conversion being readily effected by turning the base of the cradle switch.  A screwdriver is the only tool required.

The components are mounted in black-enamelled stamped-metal cases, and comprise cradle switch, induction coil, buzzer, ebonite terminal strip, 16 calling and ringing buttons with automatic release, and a hand micro-telephone.

The maximum capacity is sixteen lines, and calling is effected by removing the hand-set and pressing the button corresponding to the required number.  Further pressure actuates the buzzer at the called station.  On release, the button remains in the speaking position until restored to normal by replacement of the hand-set in its cradle.

Used as a wall set, the telephone is wired direct to the lines.  If used as a table set, a flexible cord and stamped metal junction box are necessary.

Junction boxes are also used for inter-connecting the multi-wire cables at each junction.  They comprise varnished wood cases housing the necessary complement of terminals.

The telephones are adaptable to either central battery working or local battery speaking and central battery calling, according to choice and circumstances.

Finish: Black enamel relieved nickel plate.
Length: 7ins. width, 5.5ins. depth, 3.5ins.
Cradle projection, 3.5ins.
Weight: 7.5 lbs.


Taken from the ATM Mine Telephones and Signalling Apparatus Catalogue 1928

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Last revised: October 06, 2012