Types AB 510-515
Magneto Wall Telephones
FRAMEWORK, polished walnut, constructed to hold two cells RK 360 or RK 400 (Old No. 971 or 586).
TRANSMITTER. RC 120 on adjustable arm RC 660.
RECEIVER. RD 110 (Old No. 546), with cord RS 4300 (Old No. 2030), suspended on a hook-switch.
GENERATOR. For type and number of magnets, see table below.
These generators ring satisfactorily through a line resistance of 25,000 ohms.
RINGER. For resistance, see table below.
These instruments have enclosed line terminals and are fitted with a clip for papers.
Telephones AB 511 and AB 515 are each provided with a press-button for cutting out the ringer coils and short circuiting the induction coil, the button to be pressed down while ringing.
If specially ordered, we supply these two telephones without the above press-button and with the connections so arranged that the ringer coils are cut out when the generator is operated.
Taken from the Ericsson Telephone Catalogue 1912
Last revised: September 30, 2019