IRON CASED BATTERY TELEPHONE
FOR USE IN MINES, SHIPS, ENGINE ROOMS AND EXPOSED
Cast-iron, enamelled black, with wide machined flanges on cover and case to render the instrument flame-proof.
Special loud-speaking type fitted within the case having flexible metallic listening tube.
Capsule pattern, protected by moisture-proof shield and metal grid.
The induction coil is fixed to an ebonite base, the screws fixing same forming the connection terminals so that no loose wires are used.
The switch key is of substantial dimensions, very positive in action and arranged for "normal" "ringing" and "speak" positions.
The instrument is designed for use with external speaking and ringing batteries.
All terminals are mounted on ebonite and are enclosed. All coils are specially treated to protect them against the action of moisture, and all connections are made with heavily insulated wire.
Length, 8.25 inches; depth, 5.75 inches; width, 9 inches.
18 lb. (approximate.)
Taken from the Ericsson Telephone Catalogue 1912
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