Re: Ericsson N1168 Telephone (I think)
My guess would be the "challenge" would be to use the telegraph bell system between signal boxes to indicate you want the other signalman on the phone rather than just ringing the phone.
If the key switch is spring loaded in the bottom position then you can manually key a particular cadence to indicate which party you are calling when there are thee or more phones sharing the line. Again, a guess on my part.
__________________
--
Graham.
G3ZVT
|