Auto-Reset, Push Button Selector, Single Line,
Push button instruments are extremely convenient to operate because the desired station is rung by simply taking up the micro-telephone and pressing the selector button, of the line wanted, to its full extent.
The called station has only to take up the micro-telephone to reply.
A selector button having been pressed is retained in an intermediate position to give the correct circuit arrangement and is automatically restored to normal by replacing the micro-telephone or by pressing the button of another station with which communication is desired. It is therefore unnecessary to replace the microtelephone before calling another station.
When ringing a station: if a buzzing noise is heard in the receiver it indicates line "DISENGAGED," while silence indicates line "ENGAGED."
This instrument has a case of drawn steel finished with a durable black enamel arid relieved by nickel-plated fittings.
The buttons are mounted in units of five, which are readily removed for examination or repair.
The moulded Bakelite micro-telephone, fitted with an electromagnetic receiver and an "inset" transmitter, provides a modern refinement.
Although this type of instrument is supplied as table and wall sets they are "one type sets" being easily converted from one to the other by altering the position of the cradle and changing the back fittings.
Table sets are fitted with feet which give the instrument a slight forward slope so that the button designations are more readily seen. Calls are indicated by means of a buzzer fitted inside the case.
A diagram showing the method of connecting up the instruments, call and reply sets, junction boxes, cables and batteries, is supplied.
NUMBER OF CELLS REQUIRED
Taken from the Ericsson catalogue, edition 26, supplement 1932
First introduced in 1929 - superseded by N1636 & N1637
Schematic diagram N16275
Last revised: October 03, 2019