Type CK 670
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 2100, 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 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 the Exchange are in connection, the conversation cannot be overheard by the intermediate telephone.
Height 18.90 inches
Weight 10.4 lbs.
Taken from the Ericsson Telephone Catalogue 1912
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