Military M3 Lightweigt Service Gasmask, made by ? (capital R is found) in 1943. Previous ones are made with metal parts instead of plastic. The mask is the follow-up of the famous Kops-Tissot-Monroe mask which was developed just after WWI. Last picture is in comparison with another cloth bag for the M2A1 training gasmask. differences are in the facepiece material and the head harness. There are two different coloured masks, (rubber and canvas) the most common light grey version and a darker grey version.Military "non combatant" M1A2-1-1 gasmask, produced by? There are at least 2 versions. There are inner flaps that often cover the date stamp/markings. On the top of the mask, there is a leather strap that sticks out that is sewn into the strap. Some masks have been sold with an extra green plastic-type adapter for the 40mm thread but are very particular when accepting different filters. The lid is attached via the webbing.Įxtra plastic film lenses were provided in every kit, in order to be protected from moisture and drying out, they were supplied in a paper packet. The box features webbing that is in some sections, stitched onto the box. The Typ 4 was issued with a carrying box which was made of reinforced Papier-mâché. When shaken, there is a light rattling, presumably charcoal. It is a stereotypical small grey filter with a 40mm thread with wax paper covering the intake. Unfortunately, it's unknown what filter belongs with this mask, but filters commonly sold with the mask typically feature markings of BICAPA, so it is likely that the BICAPA filters were the original or similar filter. The end result is a comfortable and secure peripheral seal.Ī chin strap is stitched into the fabric that forms the peripheral seal, to ensure the wearers chin is inserted correctly and comfortably. External overhang was fixed into place with some kind of glue adhesive and more stitching. To secure this fabric into place internally, stitching were used. A black rubber gasket inside ensures a good seal.ĭuring the masks construction, a grey/brown felt fabric was stretched over the masks peripheral seal (which at this point was just plain rubber) and subsequently folded into the rubber. This was done so that the filter can only be inserted correctly. The Typ 4 intake valve assembly has 2 parallel notches cut out of the threading. BICAPA STOCKHOLM' a date of manufacture should also feature on this housing. The metal housing is stamped: 'BIRGER CARLSON & Co. The exhale valve assembly consists of the valve itself and its protective housing made of metal. The entire exhale valve assembly can be removed by unthreading it. This assembly is affixed to the mask with a metal clamp. The Typ 4 valves are housed inside of a pear shaped steel valve assembly. The tabs themselves are stitched into the mask and a layer of adhesive is also applied to the tab. The end of each strap is stitched to a fabric tab projecting from the mask. The straps are affixed in a very secure manner. It clips into a hook assembly on the other side to create a neck-strap. These straps do not feature any kind of adjustment buckle, instead one buckle can be found further down the assembly which pulls the 3 top straps downwards to tighten them.Ī final strap featuring a D-ring can be found at the bottom. For comfort and overall ease-of-use, the Typ 4 straps are made from elastic covered in fabric similar to that covering the masks front. The Typ 4 utilised a 5-point head-harness, not too dissimilar in construction from other masks from this era. These plastic lens films have a tendency to turn slightly yellow with age - suggesting that the film might be made of cellulose. It is generally not recommended to do so the tabs are incredibly fragile and often snap off at the slightest pressure. The coils can be removed by a small metal tab that sticks slightly out. It was most likely put in to ensure the plastic lens film does not move around or unstick itself. Internally, there is a coil that spans the entire circumference of the lenses. Each lens is about 8.5mm with 6.5mm glass. The lenses had at least two layers, glass on the outside, with plastic film on the inside (to prevent fogging from exhaled breath). The actual lenses themselves are held in place by more metal rings that appear to have been crimped into the facepiece. These outer rings have a knurling texture on them. The outermost ring, fashioned from grey metal held the rest of the eyepiece assembly together. The wearers vision was provided by 2 well-constructed eyepiece assemblies. This was a common design feature intended to protect rubber components underneath. Akin to most masks of this era, the Typ 4 facepiece is made from canvas-coated rubber.
0 kommentar(er)
