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As such, this arrangement is more appropriate for divers who work or explore alone. Helmet mounts are appropriate for illuminating work which is monitored via a helmet-mounted closed circuit video camera. Hand-held lights can be directed by the diver independently of the direction the diver is facing and do not require any special mounting ...
Lightweight demand helmets are rigid structures which fully enclose the head of the diver and supply breathing gas "on demand". The flow of gas from the supply line is activated by inhalation reducing the pressure in the helmet to slightly below ambient, and a diaphragm in the demand valve senses this pressure difference and moves a lever to open the valve to allow breathing gas to flow into ...
A boat lift, ship lift, or lift lock is a machine for transporting boats between water at two different elevations, and is an alternative to the canal lock. It may be vertically moving, like the Anderton boat lift in England , rotational, like the Falkirk Wheel in Scotland , or operate on an inclined plane , like the Ronquières inclined plane ...
The divers' helmets or full-face masks are connected to the umbilical main gas supply hose and communications cable, and that the gas supply and communications system are working correctly. Setting up the stage or bell and its launch and recovery system. Setting up the hot-water supply if applicable. Setting up the decompression chamber if ...
The use of a single cylinder may require counter-weighting to prevent lateral instability in the water, depending on the buoyancy of the chosen cylinder, and does not provide a redundant gas supply. [8] No-mount diving No-mount diving is a specialized overhead-environment strategy for dealing with particularly tight restrictions. [9]
The lightweight demand helmets in general use by surface-supplied divers are integrally ballasted for neutral buoyancy in the water, so they do not float off the diver's head or pull upwards on the neck, but the larger volume free-flow helmets would be too heavy and cumbersome if they had all the required weight built in.
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In commercial and military surface-supplied diving, a backup source of breathing gas should always be present in case the primary supply fails. The diver may also wear a cylinder called a "bail-out bottle," which can provide self-contained breathing gas in an emergency. Thus, the surface-supplied diver is much less likely to have an "out-of-air ...