The 1MC was the ship's general announcing system normally controlled from the Quarterdeck (in port) and the Bridge underway for the OOD's use in carrying out the ship's routine. The system was amplified and did not work during any power outage. It could also be "keyed" from other select places like the IC Room. The "jv" circuits were sound power phone circuits maintained by IC. The "1jv" circuit was for the OOD/Bridge and included the "eyes" of the ship (the lookouts), main control (throttleman in main control served as the phone talker for the EOOW), steering gear watch (aft steering), and a few others. Other stations were added to the 1jv during special evolutions like Special Sea and Anchor Detail, GQ, Unrep, and linehandler stations. The "2jv" circuit was for the engineers, specifically the EOOW to communicate with all the watch stations under his cognizance; the 4 main spaces at all times, and others when manned for special details like forward and aft diesel, IC room and fuel stations.
Mux Barometer, Std Clock, 24hr Clock from early 70's
Courtesy BT3 Greg Bohmert
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Engine Order Telegraph
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