Rehoboth (AGS 50) - Naval Cruise Book

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4 T ,1 l l i I i THE MISSICN CF OUR CRUISE RET-l0BQll-l'S mission during This cruise was involved speciTically in de- Termining The sound velociTy characTerisTics oT The wesTern NorTh PaciTic. SpeciTically, To measure how TasT sound Travels aT various depThs in var- ious areas oT The ocean. Sound velociTy varies in The ocean as The salT conTenT lsaliniTyl, and Tem- peraTures vary. By measuring saliniTy and TemperaTure accuraTely, The sound velociTy can be deTermined maThemaTically. The saliniTy and Tem- peraTure are measured by enTrapping a sample of waTer aT a pre-selecTed depTh and Then measuring iTs saliniry by chemical or elecTronic meThods. Sound velociTy can also be measured direcTly by an elecTronic device which generaTes a sound signal and measures iTs speed over a measured disTance. The daTa Tor These sound velociTy measuremenTs are gaThered by lowering elecTronic devices over The side by winch. The winches are manned by crew members who are experTs in This Tield. The winch crews are made up oT draTTsmen, sonarmen, airmen, and seamen who have been Trained by The Qceanographic OTTicer. The daTa RET-l0BQTl-l has gaThered is very viTal To This naTion's anTi- submarine warTare program. The whole crew is involved in gaThering This daTa: Trom The engineers who geT The ship There, guarTermasTers who navigaTe, The cools who Teeds us, To The seamen who sTand waTches on The bridge. Each man aboard The ship is conTribuTing viTally To This na- Tion's naTional deTense. i- c 5 ii i 24 i