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an underwater apparatus that is lowered on a cable from a support vessel in order to conduct underwater research and work. Hydrostats are chambers constructed from strong materials, such as aluminum-magnesium alloys and fiberglass-reinforced plastics. They are usually spherical or cylindrical and large enough to accommodate one to three operators. A hydrostat with a cylindrical chamber was first built by Hartmann (USA) in 1911.

Present-day hydrostats are equipped with systems for air regeneration, devices for underwater observation, lighting equipment, scientific research instruments, and motion picture cameras. Cables are used to provide electric power and telephone communication. Hydrostats assigned to underwater work such as raising sunken ships have devices that fasten onto the work object and manipulators that are controlled from inside the hydrostat (for example, the work chambers RK-680 [USSR] and Discoverer [USA]). Sometimes hydrostats are equipped with a propeller, in order to permit limited movement while the chamber is submerged. Hydrostats now in use for deep-sea research include GG-57 and the observation chamber NK-300 (USSR) and the observation chamber Galeazzi (Italy). The maximum depth of submersion for present-day hydrostats is 300 m. Large-scale development of hydrostats for depths greater than 300 m is not expected in the future, since the lowering on a cable from a surface vessel limits the range of a hydrostat’s use. Hydrostats are now universally being replaced by autonomous apparatus and equipment.


Diomidov, M. N., and A. N. Dmitriev. Pokorenie glubin. Leningrad, 1964.


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Guided in part by nature's muscular hydrostat examples, Wilson expects that such complaint robot arms will be more robust and will be able to operate in tighter, more awkward work spaces than their conventional, rigidlimbed counterparts.
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After it filters the fluid, it goes into a suction gallery for the hydrostat that holds a 7 psi pressure head.
The 475, like the other Lexion combines, has two separate hydraulic operating systems, separate from the hydrostat, that vary in pressure from as low as 185 psi to as high as 2800 psi.
The pressure compensator is integrated within a single cartridge housing and therefore no additional compensator element or hydrostat is needed.
The combine has two hydraulic operating systems, separate from the hydrostat, that vary in pressure from as low as 185 psi to as high as 1800 psi.
Truck chassis, 2-axle, suitable for a sweeper body (semi-hydrostatic body, hydrostat is installed in the drivetrain by the sweeper builder).
Tongues, tentacles, and trunks: The biomechanics of movement in muscular hydrostats.
Tongues, tentacles and trunks: the biomechanics of movement in muscular hydrostats.