Equipment
Feldfernsprecher 33
This is a general purpose battery operated telephone. It has a bakelite case and weighs approximately 4,5 kilograms. It operates off a 1,5 volt dry cell battery. In order to call another phone, the user simply cranks the handle on the end which causes the magneto to generate sufficient current so as to cause the other phone to ring.
These could be connected in a number of ways, such as with a twin cable or with a single cable between the phones and each phone then earthed, effectively using the ground as a 'phantom earth'.
Kleine klappenschrank zu 10 leitungen mit amtszusatz 33
This switchboard enabled 10 lines to be connected to a single phone. The case is wooden with a bakelite top. When an incoming call was received, a flap would drop to indicate that someone required a connection. The plug underneath that caller would then be connected to one of the other 9 lines by inserting it in the upper hole (in the photo, a call has been connected to the recipient at line 1). On top are 10 connectors for the incoming lines.
The box on the left with the rotary dialler made it possible to connect the military phone system into a civilian phone system - as can be seen here it connects by sliding the 2 bars across to the exchange.
Both these items are fully operational, however the rotary dialler can't be used anymore as it needs an analogue exchange!