. Bell telephone magazine . rns and mounted on a yokeand tripod. The useful range of thePAB—I naturally depends on localconditions, and will vary in differentlocations. When a greater area ofcoverage than that of a single systemis needed, it is possible to operate twolamplifiers and loud speakers from oneengine alternator and one micro-phone. Similarly, when still greatercoverage is needed, one microphonemay be used to operate four ampli-fiers and loud speakers powered bytwo engine alternators. After these Public Address Sets[have done their part in helping toiestablish the beachhead, they may
. Bell telephone magazine . rns and mounted on a yokeand tripod. The useful range of thePAB—I naturally depends on localconditions, and will vary in differentlocations. When a greater area ofcoverage than that of a single systemis needed, it is possible to operate twolamplifiers and loud speakers from oneengine alternator and one micro-phone. Similarly, when still greatercoverage is needed, one microphonemay be used to operate four ampli-fiers and loud speakers powered bytwo engine alternators. After these Public Address Sets[have done their part in helping toiestablish the beachhead, they maymove on with the advancing troops ormay remain to direct the continuingflow of supplies, machines, andtroops. At forward command poststhey have been used for surrender de-mands, and for conveying essential information to the troops when othermeans are either lacking or too haz-ardous to use. The Voice of Ship Command It is not only on invasion beaches,however, that high volume public ad-dress systems are required to over-. A bosn pipes the crew to attention overthe ships announcing system. A typ-ical system installed on a battleshipincludes eight transmitting stations, 294loudspeakers, seven local announcingcircuits, and 31,000 feet of cable ride the noise of battle. Consider,for example, a battleship plowing si-lently along at night in enemy shrill scream of the bosns pipestartles a sailor from slumber. A fewseconds later, wide awake, he hearsa Bong! Bong! Bong!—the re-peated bell-tone of General means an emergency. He listens 46 Bell Telephone Magazine SPRING carefully to the announcement whichfollows, telling him the cause of theemergency. It might be a fire, a callto battle stations, or any other seriouscondition, and he goes quickly to thestation he has been trained to manin such an emergency. These alarms and instructions comethrough the Battle Announcing Sys-tem, with which all of the two orthree thousand men aboard a largewarship are informed o
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