Wwii british gas mask bag12/23/2023 ![]() After some time, this design would become known as the Type E Mk. The pads improved the level of filtration by using a mixture of wool and asbestos fibre, claimed in 1989 by Porton Down to be roughly 80% wool, specifically Merino Sheep Wool, and 20% Asbestos, specifically Crocidolite (Blue Asbestos). The Type E Container was composed of two sets of two pads, diaphragms and charcoal. The first step was in moving from the older box container to the first true anti-gas container, the Type E of 1929. Due to the increasing ease of developing nose-gases, particulate protection was something which scientists began to focus on. The Type D Container contained proper filter component which allowed it to function better when filtering nose gases, something the Type A, and other box respirator containers were unable to filter. IV, as mentioned before, was fitted with Type A Containers for training purposes and Type D Containers for actual use. 1 and 2, the former for telephone switchboards and the latter for both telephone switchboards and wireless sets. Whilst a simple modification to the temple area of the mask resulted in the facepiece known as the Special T (T for Temple), designed for tube with abnormal head-shapes, this design was also expanded upon to feature a hollow cylindrical boss on the left cheek with a plug attached which would allow the insertion of Respirator Microphones Nos. Over time, the requirement for communications equipment to be used was becoming more and more apparent and, as such, respirators needed to be able to be worn whilst crew operated said equipment. IVA variant featured a double-length tube, connected in the middle with a fabric part also featuring a small eyelet for securing the tube. IV featured a short tube which connected to a container which would be sat in the haversack whilst mounted to the soldier's chest, a position referred to as "chest-position" or "alert-position". The Respirator was initially created in two variants, the Mk. Companies such as Avon India continued to use the gum-type rubber into the mid-1930s but this was completely phased out by the beginning of the war. This, however, fell out of service in favour of the black rubber blend which enabled the use of reclaimed rubber to reduce costs. The rubber used, initially was an orange/red rubber often referred to as "gum rubber". This part also incorporated a tube which would connect by wire and tape to a corrugated, stockinette-coated rubber tube. IV did away with the archaic flutter-type exhale valve and used a simple suspended disk-type valve in a metal housing known as a valve holder. III and was a very similar shape, however, the improvements to the older design were many. ![]() Respirator featured the same thread-less eyepieces found on the Mk. IV, it was the favoured design which saw service following the war. ![]() V in 1939 and was issued with stockinette removed. This was designed to stop the need of standard and Special T Mic faceblanks. New variants of the in/outlet assembly were developed and even a new faceblanks with a sealed mic port which could be cut into. III Eyepieces were introduced, with two parts threaded together which would allow for easier lens replacement. It was also around this time that the later Mk. IV General Service Respirator.ĭuring the 1930s, the push for use of reclaimed black-rubber resulted in reduced, and eventually discontinued, use of the orange natural rubber faceblanks, though this rubber was still used to seal the eyepieces. By 1926, it was complete and named the Mk. However, the need to move on from primitive features such as mouth-pieces, flutter-valves and box containers was clear and so, development on a new respirator facepiece began. III and II were used with the container which would become the Type A. By 1922, the training container became known as the Type A and the mobilisation container, the Type D.ĭuring the early inter-war years, G. The mobilisation container was based on the 1918 improved container, similar to the US MI Felt Canister (it is unclear which was designed first). The training container was a general upgrade to the late box respirator container, filled only with charcoal. In 1919, policy dictated that two containers should be designed and used by the British Armed Forces, one for training and one for mobilisation.
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |