Type CK 660
Sub-Station Wall Telephone for use with an Intermediate
Common Battery System
FRAMEWORK, polished walnut.
MICRO-TELEPHONE. RE 1051, with cord RS 6500 (Old No. 2061), resting on a cradle switch.
GENERATOR. RH 2400, 2-magnet.
POLARISED RINGER of 1,000 ohms resistance.
LINE CONDENSER of two microfarad capacity.
This telephone has a protector mounted on the lower part of the backboard, and the line terminals are enclosed. It is also fitted with a clip for papers.
When the sub-station telephone and the intermediate station telephone are in connection, their conversation cannot be overheard by the Exchange, or by any of the lines connected, and when the sub-station telephone and she Exchange are in connection, the conversation cannot be overheard by the intermediate station telephone.
Height 20.50 inches
Weight 11.7 lbs.
Taken from the Ericsson Telephone Catalogue 1912
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