. The Composition of sea-water : comparative and descriptive oceanography. Seawater -- Composition. SECT. 5] DEEP SUBMERSIBLES FOR OCEANOGRAPHIC RESEARCH 511 gasoline because of its low compressibility and non-flammability. The single manned compartment, placed forward, is a 9-ft sphere of die steel; the hull is of titanium. The main buoyancy tanks are sealed off from water but are sufficiently compressible to equalize the pressure of the ammonia solution with the ambient sea-water pressure. A motor will make possible a top speed of 6 knots. Silver-cadmium batteries will permit 10


. The Composition of sea-water : comparative and descriptive oceanography. Seawater -- Composition. SECT. 5] DEEP SUBMERSIBLES FOR OCEANOGRAPHIC RESEARCH 511 gasoline because of its low compressibility and non-flammability. The single manned compartment, placed forward, is a 9-ft sphere of die steel; the hull is of titanium. The main buoyancy tanks are sealed off from water but are sufficiently compressible to equalize the pressure of the ammonia solution with the ambient sea-water pressure. A motor will make possible a top speed of 6 knots. Silver-cadmium batteries will permit 100-mile cruises at 3 knots. The plan is to conduct cruises as long as 48 h duration. Capable of descending to 36,000 ft, the will be without depth limitation in the oceans of the world. With its large hydrophone, storage bins, laboratory pit, Telescoping sea hatch Hydrophone Motor Rotary converter \. Fig. 8. Tentative design as currently conceived of the (Deep-Research Vessel). manipulator, etc., the would have scientific as well as cruising range that the present bathyscaphs lack. 7. Remote Underwater Manipulator (RUM) Thus far we have considered only manned craft; unmanned vehicles may serve a vital function in future deep-sea oceanography. The RUM (Fig. 9) is a robot undersea crawler conceived by V. Anderson of Scripps Institution of Oceanography and constructed under the sponsorship of the Office of Naval Research. The prototype, completed in 1960, has a tank chassis modified for underwater mobility. It is equipped with a prehensile arm, four underwater television cameras, and a special sonar for guidance. It is contemplated that this robot will be capable of performing a wide variety of oceanographic missions such as the installation and maintenance of heavy bottom-mounted instruments at depths of up to 20,000 ft. The robot tank draws its power through a lightweight coaxial cable which is connected with a mobile generator on shore. This cable also carri


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