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
After use, carefully dry the mouthpiece and eye rims from the inside and also inside surface of the mask, so as to remove the condensed moisture resulting from the breath. If the nose-clip slips off the nose, replace at once. The eyepiece is held with the other hand while this is being done. If the eye-pieces become dull they can be cleaned by inserting the forefinger into the pockets alongside the goggles and wiping the inside of the windows. After speaking, immediately replace the mouthpiece and make certain that the nose-clip is properly adjusted. If it is necessary to speak, breathe in deeply, grasp the metal tube outside the mask and carefully remove the mouthpiece from between the lips – care being taken not to move the nose-clip. Do not attempt to speak while wearing the respirator except in case of necessity. Complete the fitting of the mask by pulling it well on over the jaw and by smoothing the edge all round the face. Open the nose clip by pinching from the outside the circular wire spring below the goggles push the clip buttons on to the lower part of the nose and release the spring, making sure that the nostrils are closed. Then start breathing in and out through the tube. Holding the metal mouth tube in the right hand outside the mask, push the rubber mouth piece well into the mouth and draw it forward so that the rubber flange is between the teeth and the lips, and grip the two small rubber projections with the teeth. Push the chin well into the mask and at the same time draw the elastics over the head AS FAR AS THEY WILL GO, i.e. Throw the chin well forward ready to enter the mask. Take the mask out of the satchel and seize it with both hands, the fingers gripping the edge of the mask and both thumbs pointing inwards and upwards UNDER the elastic. Open the haversack by pulling the cover forward, and grip the mask with the right hand. Unfasten the buckle of the tape which keeps the box in the haversack, and lift out the box remove the indiarubber stopper from the bottom and then put the box back in the haversack. Unbutton the snap fasteners, but keep the flap closed towards the body to protect the respirator from wet. Take the coil of whip cord out of the haversack, pass it through the ring pointing to the right of the haversack, round the body, and tie it firmly to the ring pointing to the left of the haversack. Raise the haversack on to the chest by pulling the sling with the left hand until the brass stud on the sling is low enough to button on to the leather tab on the left side of the haversack. Pass the left arm backwards through the sling so that the haversack hangs in front of the body. #WWI GAS MASK BAG HOW TO#
Instruction leaflet to explain to soldiers how to use a box respirator for protection during a gas alarm, (Catalogue ref: WO 142/183) Transcriptĭirections of use of small box respirator.Īt ordinary times, the haversack containing the Box Respirator is to be carried slung over the right shoulder, WITH THE FLAP FASTENERS NEXT THE BODY.
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