![]() ![]() The apparatus is carried in a special haversack which is divided into two compartments, one containing the box and the other the mask.ĭETAILED REFERENCE TO THE VARIOUS PARTS OF THE SMALL BOX RESPIRATOR. The nose must be closed by the clip in order to prevent any breathing into the face piece and to ensure that inspiration and expiration take place only through the mouth-tube. The goggles, if steamy, can be wiped by inserting the forefingers in the temple pockets provided in the mask. The fabric of the mask is impervious for reasonable lengths of time to all gases, and therefore provides protection for the eyes against lachrymation. It is held in position by elastics which are slipped over the head and arrested in the proper position by a head tape. The mask, besides containing the mouth piece, is provided with goggles and a nose-clip, and fits tightly across the forehead, down the sides of the cheeks, and under the chin. It is diverted through a side tube and expelled from the respirator by the working of two valves, one, in the bottom of the box opening on inspiration and closing on expiration, and the other, situated on the breathing tube just outside the face-piece, opening on expiration and closing on inspiration. The box contains granules which absorb the poisonous gases, so the air passing along the breathing tube is pure.Įxhaled air, on the other hand, does not pass through the box. When the respirator is in use, all air inhaled by the wearer passes through the box along the breathing tube into the wearer’s mouth. The small box respirator consists essentially of a box connected by means of a breathing tube to a mask constructed to fit closely over the face. Replace the stopper in the bottom of the box when the gas-alert is no longer on.Įxtract from notes from the War Office about the box respirator gas mask which explain how it worked, (Catalogue ref: WO142/183) Transcript
0 Comments
Leave a Reply. |