The prospect of using telecommunications equipment whilst under the threat of gas could not be ignored, thus a cylindrical rubber protrusion was molded with each rubber mask. Externally, the rubber mask was moulded with a portion of rubber that served as a mount for a triangular plate that held the flapper valve. Internally, the rubber mask features a singular extension of rubber which appears centrally above the eyepiece assemblies which served as structural support for the mask. The facepiece was produced in two sizes: Normal and Small. The thicker, higher quality rubber allowed the CD to be cleaned by harsher disinfection solutions compared to the GCR - this is noted in many ARP manuals. It was molded of much thicker rubber which was the basis for its robustness. The rubber mask of the CD was of stout design compared to the British General Civilian Respirator, due to the conditions in which it was expected to be deployed. 4 Politics and Supply of Civilian Duty Respirators.3 Gas Drill for Civilian Duty respirator.The CD would fall out of front-line usage by 1942 as it was around this time that police, firemen and others began being equipped with the GS respirator instead.ĭuring the Cold War, Siebe Gorman produced an industrial variant of this mask using modified No. Early prototype Civilian Duty respirators can be seen in a patent filed by Sadd on the 30th October 1928.Īs the prospect of war became more and more likely, the CD respirator found itself as the front-line respirator for many civilian based defense organizations such as the ARP, police, ambulance crews, industry and dock workers. Whilst often believed to be a wartime design, the Civilian Duty began its conception in the hands of Major. Officially, the Civilian Duty was designed for members of civil air raid precautions services and others who might be called upon to carry out their normal duties in the presence of gas, but who are not likely to be continuously exposed to the highest concentrations. Leyland & Birmingham Rubber Co., Avon India Rubber Co., P.
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