Ships – Building – Canal and ferry boats
Patent
1987-08-14
1988-09-13
Gellner, Michael L.
Ships
Building
Canal and ferry boats
114312, G03B 1708
Patent
active
047713208
ABSTRACT:
An apparatus and method for extending the depth range of an underwater pressure hull such as an underwater camera body by supplying gas to balance the internal hull pressure with the ambient water pressure. The balancing gas is supplied by a variable volume reservoir pneumatically connected to the pressure hull. The reservoir is reduced in volume by an increase in ambient water pressure to thereby increase the internal pressure of the system according to Boyle's Law. Conversely, a decrease in ambient water pressure results in an increase in the reservoir volume which reduces the internal hull pressure accordingly.
REFERENCES:
patent: 1131712 (1915-03-01), Klein
patent: 3759605 (1973-09-01), Johnson
patent: 4041507 (1977-08-01), Ko et al.
patent: 4113137 (1978-09-01), Wind
Gell Harold
Gellner Michael L.
Sea Fathoms Industries
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