Callbox Phone
Unmarked. Small tag on top "Patent Applied for."
"Z40" cast into baseplate.
Goes in a large cast metal enclosure. Probably used by the
beat
policeman to report in or in a fire call box..
Once the E1 handset was taken off-hook, activating the lever
wound a spring that caused the station's code to be sent down the line.
In this case, the cam follower automatically "dials" 3-6.
The brass mechanism was covered with a glass disk (removed for
the photo) to keep it clean.
There are also two pushbuttons for signaling.
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