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Drass-Galeazzi – Italian manufacturer of lightweight diving helmets – Italian diving equipment manufacturer. Lightweight diving helmets. [28] [46] Dunlop Rubber – British multinational company manufacturing natural rubber goods – Manufacturer of swimfins during WWII. The Dutch Diving Helmet – Shallow water diving helmets. [47]
The usual meaning of diving helmet is a piece of diving equipment that encases the user's head and delivers breathing gas to the diver, but the term "diving helmet", or "cave diving helmet" may also refer to a safety helmet like a climbing helmet or caving helmet that covers the top and back of the head, but is not sealed. These may be worn ...
Standard diving dress, also known as hard-hat or copper hat equipment, deep sea diving suit or heavy gear, is a type of diving suit that was formerly used for all relatively deep underwater work that required more than breath-hold duration, which included marine salvage, civil engineering, pearl shell diving and other commercial diving work, and similar naval diving applications.
The main focus was on the US Navy Mk V helmet, a typical free-flow copper helmet used with standard diving dress, but shallow water diving equipment is also covered. [1] [4] 1952 - Diving Manual, document identity NAVSHIPS 250–880, also published by the Navy Department, Bureau of Ships, to supersede the 1943 manual. It has nine parts: History ...
1. A term originally referring to diving with standard diving dress, where the helmet is sealed to the watertight diving suit, as contrasted with a shallow-water diving helmet, which is open at the bottom and was used for work in shallow water where the diver could ditch the helmet and make a free ascent in an emergency. Several incompatible ...
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 ...
If the diver's airway is protected by a full-face mask or diving helmet, the immediate risk is death by asphyxiation, which can occur within a few minutes of cessation of breathing. If the diver sinks and the pressure increases sufficiently, the gas may become capable of supporting consciousness again, but the problem of latent hypoxia remains ...
See: Standard diving dress#Helmet. A valve in the side of a copper diving helmet which could be used by the diver to suck in a mouthful of seawater to spit onto the inside face of a viewport to wash off condensation droplets to improve their view. [105] SPM. See: single point mooring. spool 1. See: Distance line#Spools