Field phone and switchboard inter-operability

[Gary_GJK]

Thanks all for the above, especially Chris for going through the various types of phone and switchboard. I'm still hoping to finish my write-up for WW2 era Inf and Armd Div Sigs, and having spent a lot of time on wireless realised I hadn't put much effort into line equipment. The differentiation between buzzer and magneto calling/receiving was something I only recently recognised and encouraged me to go dig more into the subject.

Cheers,

Gary