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The J Circuits
Seaman - Military manual for the Seaman rate
Typical MC Unit
concerned. It connects the bridge and other conning stations with main engine control, steering aft, and other emergency steering stations. It has outlets on the main deck for control of the anchor detail and line-handling parties fore and aft. This circuit is always manned by CIC, and may be manned by other control stations when advisable. The conning officer controls the 1JV, and the circuit is always manned-or at least is ready for instant use-whenever the ship is underway. The   JW  is  the  navigator's  circuit  by  which Quartermasters  stationed  at  peloruses  may  report directly to the navigator at the chart table. During piloting, the JW is connected with communication spaces. The JZ circuit is the damage control circuit by which damage control parties can communicate with DC  Central. Some of the foregoing circuits may vary slightly on different ships. As soon as you report aboard a new ship for duty, you must learn the details of any possible variance. AUXILIARY  BATTLE  CIRCUITS The auxiliary battle circuits form a secondary system, consisting of sound-powered lines that are not routed through a switchboard. Most of the important circuits  described  previously  have  substitutes  in  the auxiliary  system. An auxiliary circuit is designated by the letter X, followed by the symbol of the circuit for which it is a substitute.  Many  circuits  are  equipped  with  call  buzzers so that communication can be maintained with stations on the circuit without the circuits having to be manned continuously. A typical example is the  X1JV, which permits  the  OOD  to  exchange  communications  directly with the engineering officer of the watch. VOICE  TUBE On most mine craft, patrol boats, and the like, the voice  tube  still  is  the  primary  means  of  interior communications,  although  some  small  craft  have sound-powered-phone  circuits.  A  voice  tube  requires neither  electrical  nor  sound  power,  but  its  effectiveness decreases, of course, in direct ratio to the length of the tube and number of bends it contains. On large ships, communication by voice tube is for short distances only, as  between  open  conning  stations  and  the  pilothouse. SHIPBOARD ANNOUNCING SYSTEMS In the old Navy, before the days of loudspeaker systems, an all-hands order was passed by word of mouth by the Boatswain's Mates fore and aft. The boatswain  or  BM  of  the  watch  sounded  “CALL MATES” on his pipe to get the BMs together, and they answered repeatedly with the same call from various parts of the ship as they converged on the bridge or quarterdeck.  When  they  heard  the  word,  they  dispersed fore and aft to sing it out at every hatch. This procedure was very colorful, but it took a lot of time. Now, a single Boatswain's Mate can pass the word over the MC circuit in short order, while the others stay where they are, keeping the gang heaving around. The  basic  MC  circuit  is  the  1MC,  the  general announcing system, over which word can be passed to every space in the ship. The general alarm system is tied into it as well. Transmitters are located on the bridge, quarterdeck,  and  central  station;  and  additional transmitters may be at other points. See figure 2-18. The OOD is in charge of the 1MC. Except for possibly an emergency call by the damage control officer, no call may be passed over the 1MC unless authorized by the OOD, the executive officer, or the captain. Normally, the 1MC is equipped with switches that make it possible for certain spaces to be cut off from announcements  of  no  concern  to  them.  The  captain,  for Figure 2-18.— loudspeaker transmitter. 2-17

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