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The no-bolt helmet used a spring-loaded clamp to secure the helmet to corselet over the suit gasket, and many helmets were sealed to the breastplate by a 1/8 turn interrupted screw thread. Swedish helmets were distinctive for using a neck ring instead of a corselet, a precursor of more modern diving equipment, but cumbersome and uncomfortable ...
Corselet showing interrupted thread for helmet connection and brailes clamping it to the suit. 12-bolt in background, 6-bolt in foreground. The corselet, also known as a breastplate or gorget , is an oval or rectangular collar-piece resting on the shoulders, chest and back, to support the helmet and seal it to the suit, usually made from copper ...
A diver in a pool wearing an AGA full face mask A diver wearing an Ocean Reef full face mask Head protection helmet for use with Ocean Reef full face diving mask. A full-face diving mask is a type of diving mask that seals the whole of the diver's face from the water and contains a mouthpiece, demand valve or constant flow gas supply that provides the diver with breathing gas. [1]
A jackstay is a form of guideline laid between two points to guide the diver during a search or to and from the workplace or to support and guide equipment for transport between two points. [ 6 ] Lifting bags , an item of diving equipment consisting of a robust and air-tight bag with straps, which is used to lift heavy objects underwater by ...
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 helmet is a close fit to the head and moves with the head, allowing the diver to aim the viewport using head movement to compensate for the restricted field of vision. [40] Free-flow helmets compensate for a potentially large dead space by a high gas flow rate, so that exhaled gas is flushed away before it can be rebreathed. [41]:
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A diving mask (also half mask, dive mask or scuba mask) is an item of diving equipment that allows underwater divers, including scuba divers, free-divers, and snorkelers, to see clearly underwater. [ 1 ] [ 2 ] Surface supplied divers usually use a full face mask or diving helmet , but in some systems the half mask may be used. [ 2 ]