. The Earth beneath the sea : History . SINKING SLOWLY 20FT/HIN Fig. 3. Hydrophone suspensions: (a) SIO method; (b) LGO-WHOI method. weight a neutrally buoyant cable leads up 200 ft to the water surface where it is fastened to a group of small i:)lastic floats and then back to a cable-puller or a winch on the ship. The hydrophone system is shown in Fig. 4. During reception of a seismic station other operations such as coring, heat- flow measurements, underwater photography, hydrographic casts, bathy- thermograph observations, and normal laboratory and ship work are continued so that in all cas
. The Earth beneath the sea : History . SINKING SLOWLY 20FT/HIN Fig. 3. Hydrophone suspensions: (a) SIO method; (b) LGO-WHOI method. weight a neutrally buoyant cable leads up 200 ft to the water surface where it is fastened to a group of small i:)lastic floats and then back to a cable-puller or a winch on the ship. The hydrophone system is shown in Fig. 4. During reception of a seismic station other operations such as coring, heat- flow measurements, underwater photography, hydrographic casts, bathy- thermograph observations, and normal laboratory and ship work are continued so that in all cases the ship's auxiliary power is kept on. In windy conditions the main propulsion engines are on, and the ship heads into the wind with the screw turning over slowly to keep the hydrographic wire vertical and the hydrophone cables slack. If ship drift becomes too great and the hydrophone cables pull tight the mechanical filtering action is lost, the hydrojihones rise toward the surface, and wave and flow noise develop. In such cases, if steaming
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Keywords: ., bookcentury1900, bookcollectionbiodivers, booksubjectoceanbottom
