Type CK 650
Sub-Station Wall Telephone for use with an Intermediate Telephone Station
Common Battery System
FRAMEWORK, polished walnut.
TRANSMITTER. RC 141, on adjustable arm RC 602.
RECEIVER. RD 201, with cord RS 4010 (Old No. 2094), suspended on a hook-switch.
GENERATOR. RH 2100, 2-magnet.
POLARISED RINGER of 1 1000 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.
If the sub-station is speaking with the intermediate station, their conversation cannot be overheard at the Exchange, or by any of the lines connected with the intermediate station.
When the sub-station telephone and the Exchange are in connection, the conversation cannot be overheard by the intermediate station.
Height 18.90 inches
Weight 11.9 lbs.
Taken from the Ericsson Telephone Catalogue 1912
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