![]() ![]() The two straps on each side are held against the mask by a bridge loop. The lowest strap is attached horizontally at the cheek, with the clip pad attachment point forward from the edge of the mask. (2) Harness attaches to the M4 and M4A1 masks with a riveted clip on pads. Lowest strap, at the cheek, is attached to a tab at a 45° angle, at the edge of the mask. (1) Harness attaches to the M3 and M3A1 masks with a riveted clip, flat against the mask and near the edge. This table lists the components and construction details across the M3 and M4 series variants: It can be difficult to distinguish the M3 from the M4 series masks due to the identical facepiece. Identifying the M3 and M4 Series Lightweight Service Gas Masks īoth the M3 and M4 series Lightweight Service Gas Masks use the M2A2 facepiece, but have a shorter hose and a different canister than the M2A2. A modification to the outlet valve resulted in the M4A1 Lightweight Mask in 1945. The M4 series masks were made of natural rubber in olive drab color. It had many features in common with the M3 series, including the M2A2 facepiece, internal nosecup, outlet valve, shorter hose and lighter M10A1 canister. In 1942, the M4 Lightweight Mask was standardized to add additional improvements. The M3 series remained in use until obsoleted in 1949. Over 13 million of the M3 series masks were produced during World War II. In 1944, the M3A1 mask was released featuring an improved outlet valve. The Neoprene was found to become unusable in cold weather due to hardening of the mask under those conditions while the natural rubber remained flexible even in cold weather. The M3 was manufactured from both grey rubber and black Neoprene (synthetic rubber). The corrugated hose between the facepiece and the canister was shortened to save materials. The changes and improvements retained the same level of protection to the wearer as the M2 series mask. It used the molded rubber facepiece from the M2A2 mask with the addition of an interior anti-fogging nosecup, and an improved, lighter M10A1 filter canister. In 1942, the M3 Lightweight Service Gas Mask was standardized, weighing only 3.5 pounds vs. The unsatisfactory weight and bulk of the M2 series masks led to the development of an improved service gas mask. No value at all for working in.The M4 Lightweight Service Mask was a gas mask used by the United States during World War II. "Conclusion: Masks invaluable in gas attack when dogs remain out of work, walking or sitting. If the filter was removed the dog knew there was someone about, but could get no sense of direction," said the report, which has remained secret for more than 50 years. The school at Northaw, Hertfordshire, reported that although the masked dogs were "all quite comfortable" walking and sitting while on patrol, when asked to do anything else they were useless: "Completely confused when asked to work on a/c of the intake of air coming from under the chin, no direct scent can reach the nose, and it appears that if it did the container filter would be faulty. When the masks were tried on 120 army dogs most fitted quite well, but War Office papers show that the dogs could not carry the masks on their backs because "of the difficulty of getting through obstacles (hedges, barbed wire, etc)" and so it was decided that the respirator should be carried by their handlers. The War Dog Training School chose not to attach the mask to the dog's collar on the grounds that that was used for message carrying. It consisted of a rubberised canvas mask with a filter attached to the dog with a body harness. They worked in pairs, mostly at night, and relied almost entirely on their sense of smell.Ī respirator was developed with a level of protection equal to that of "the human light respirator". The dogs, mostly alsatians, retrievers and collies, had been in use since early 1943 to patrol vulnerable points and on messenger duties with troops in the frontline. ![]() The War Office said the masks were needed "in view of the increasing use of dogs for essential duties". The War Office's chemical weapons research station at Porton Down, Wiltshire, strove from April to October 1944 to protect dogs against gas on the battlefield. ![]()
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