| 摘要 |
PCT No. PCT/GB85/00013 Sec. 371 Date Sep. 5, 1985 Sec. 102(e) Date Sep. 5, 1985 PCT Filed Jan. 10, 1985 PCT Pub. No. WO85/03049 PCT Pub. Date Jul. 18, 1985.Buoyancy apparatus for carrying a payload to and maintaining the payload at substantially a constant depth or within a desired range of depth, which comprises a variable buoyancy vessel, a depth sensor, deflectable members for detecting upwards and downward movement respectively linked to a gas supply to increase the buoyancy by displacing water from the buoyancy vessel on detecting downward movement and to decrease the buoyancy by operating a release valve to vent gas from the buoyancy vessel on detecting upward movement, and apparatus for preventing said buoyancy variations commencing until the depth sensor senses that the payload is at a predetermined depth.
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