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The US Navy first provided a diving manual for training and operational guidance in 1905, and the first book titled Diving Manual was published in 1916. Since then books titled Diving Manual or U.S. Navy Diving Manual have been published several times, each one updating the content of the previous version. The amount of information provided has ...
A depth gauge is an instrument for measuring depth below a vertical reference surface. They include depth gauges for underwater diving and similar applications. A diving depth gauge is a pressure gauge that displays the equivalent depth below the free surface in water. The relationship between depth and pressure is linear and accurate enough ...
In open circuit scuba the upper limit for oxygen partial pressure is generally accepted as 1.6 bar, [37] equivalent to a depth of 6 msw (metres of sea water), but in-water and surface decompression at higher partial pressures is routinely used in surface supplied diving operation, both by the military and civilian contractors, as the ...
The first recreational mechanical analogue dive computer, the "decompression meter" was designed by the Italians De Sanctis and Alinari in 1959 and built by their company named SOS, which also made depth gauges. The decompression meter was distributed directly by SOS and also by scuba diving equipment firms such as Scubapro and Cressi.
The US Navy has used several decompression models from which their published decompression tables and authorized diving computer algorithms have been derived. The original C&R tables used a classic multiple independent parallel compartment model based on the work of J.S.Haldane in England in the early 20th century, using a critical ratio exponential ingassing and outgassing model.
Capillary gauges have been shown to be a conservative method for measurement of compensated depth at altitude. [5] Modern dive computers detect changes in altitude or accept it as a user input and automatically adjust their calculation of a safe decompression regime for a dive at that altitude. [ 6 ]
Routine scuba diving procedures (order may vary slightly, and some are also relevant to surface supplied diving, though details may vary): Dive planning – The process of planning an underwater diving operation. Selection of equipment – A diver is expected to be able select appropriate equipment and check it for fit and function.
Royal Navy practice before 1962 is described by Robert Davis in his book "Deep Diving and Submarine Operations", and the Royal Navy's The Diving Manual of 1943. Rate of ascent to the first stop was limited to 60 feet per minute, largely to avoid overshooting the first stop, an artifact of the method for measuring depth by pneumofatometer off ...
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