Derek,
Below you will fine the components for communication between the various compartments of the Type IXC boats. Remember, this is only for the IXC boats.

Forward Torpedo Room - Two loudspeakers one adjacent to the torpedo tubes. One installed microphone adjacent to the torpedo tubes with provision for connection of a portable head-set and microphone.

Battery Compartment - One loud speaker in the Petty Officers Quarters. One loud speaker in the Chiefs Quarters. One loud speaker in the Officers Quarters. One loud speaker in the Radio Shack designated as the Control Unit. This speaker may be operated independently of all other speakers. A 20 watt amplifier and control section in a common housing is located in the Radio Shack with provision for selecting output from radio receiver or record player.

Control Room - Two loud speakers. One microphone, located near the diving station with provision for connecting a portable microphone and head set.

Conning Tower - Two loud speakers. Two bulkhead type midrophones connected in parallel and controlled from a common switch located in one of the microphone. A connection box with provision for connecting a portable microphone and head set.

The Bridge - No permanently installed components. A microphone and head set is led up from the outlet in the C.T. through the bridge hatch.

Engine Room - One loud speaker.

Maneuvering Room - One loud speaker. One microphone with provision for a portable head set and microphone.

Aft Torpedo Room - Two loud speakers are installed, one located adajecent to the tubes. One microphone located adjacent to the tubes with provision for a portable head set and microphone.

I hoped this helped in some way, keep in mine that this was for only the Type IXC boats.

Scott