![]() In aerospace there are applications in unpressurised aircraft and for high altitude parachute drops, and above the earth's atmosphere, in space suits for extra-vehicular activity. On land they are used in industrial applications where poisonous gases may be present or oxygen may be absent, firefighting, where firefighters may be required to operate in an atmosphere immediately dangerous to life and health for extended periods, in hospital anaesthesia breathing systems to supply controlled concentrations of anaesthetic gases to patients without contaminating the air that the staff breathe, and at high altitude, where the partial pressure of oxygen is low, for high altitude mountaineering. Rebreathers are used in many environments: Underwater, diving rebreathers are a type of self-contained underwater breathing apparatus which have provisions for both a primary and emergency gas supply. Rebreather technology may be used where breathing gas supply is limited, such as underwater, in space, where the environment is toxic or hypoxic (as in firefighting), mine rescue, high-altitude operations, or where the breathing gas is specially enriched or contains expensive components, such as helium diluent or anaesthetic gases. The same technology on a vehicle or non-mobile installation is more likely to be referred to as a life-support system. A rebreather is generally understood to be a portable unit carried by the user. The purpose is to extend the breathing endurance of a limited gas supply, and, for covert military use by frogmen or observation of underwater life, eliminating the bubbles produced by an open circuit system and in turn not scaring wildlife being filmed. This differs from open-circuit breathing apparatus, where the exhaled gas is discharged directly into the environment. Oxygen is added to replenish the amount metabolised by the user. A short strap with a quick release spring clip, for the attachment of a lead, is sewn to the bottom of the left side neck opening.A fully closed circuit electronic rebreather ( AP Diving Inspiration)ĬCUBA (closed circuit underwater breathing apparatus) CCR (closed circuit rebreather), SCR (semi-closed rebreather)ĭavis apparatus, Self-contained breathing apparatus, Escape hoodĪ rebreather is a breathing apparatus that absorbs the carbon dioxide of a user's exhaled breath to permit the rebreathing (recycling) of the substantially unused oxygen content, and unused inert content when present, of each breath. The straps can be threaded through any of them to suit an individual dog. Both straps thread through a vertical strip of ersatz fabric machine stitched at intervals to provide five pockets. Two ersatz fabric straps with metal buckles close the neckpiece on the left side. ![]() The fur lining shows through on each side of the neck where it opens to allow the mask to be fitted over the dog's head. ![]() ![]() The headpiece, between the eyes and the stop, and the neckpiece, are lined with strips of rabbit fur. The headpiece and end of the snout are machine quilted to give additional stiffness so that the mask will not collapse around the dog's nose. The central part of the eyepieces originally contained an inner layer of celluloid (now split) and an outer layer of mica (now missing, and already described as being damaged when the mask was collected). The mask has a flat snout like nose, separately inserted pieces for the ears, and large metal rimmed eyepieces attached over a circular leather flange. Gas mask/respirator for a messenger or guard dog, made from ersatz (substitute) fabric, made from coarsely woven paper and fabric blend fibre. ![]()
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