It was quickly recognised in the 1930s that a level of respirator was required that fell between the cheap but limited civilian respirator and the far more effective, but expensive, general service respirator. The government therefore introduced the Civilian Duty Respirator, the “Air Raid Precautions Handbook No1” described it as:
The Civilian Duty respirator has been 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.
The civil duty respirator was issued with a canvas haversack, an anti-dimming set and an instruction leaflet:We will take a closer look at the haversack next week, tonight we are concentrating on the respirator itself:Returning to the ARP Handbook No1, the following description was provided for the mask:
The facepiece is of stouter construction the in the case of the civilian respirator, to withstand harder wear. It is made of rubber, moulded to fit closely to the face. It is fitted with an outlet valve, and has a protuberance on the left cheek to which a microphone can be attached for those regularly employed of telephone work.The facepiece is held in position on the face by elastic bands passing round the back of the head. These can be adjusted for fit and comfort by means of buckles.The rubber of the facepiece fits tightly round the end of the container and is secured by means of a metal band, or, in earlier examples, by cord.
The eyepieces are made of strong plain glass discs fitted into metal rims, and are removable by unscrewing for decontamination purposes. There were three different patterns of canister on these masks, the MK I was made of waterproofed cardboard with metal ends. The MK II was identical but made entirely from metal. The third pattern is the one one this mask:C.D. Mark III: an improved and slightly larger container, which is in fact identical with the container of the civilian respirator except that the charcoal in it has a higher degree of activation. The main effect of this difference is that the container can absorb more gas before becoming saturated- i.e. That it’s effective life in use is longer. In this container the inlet valve is at the inner end, and can itself be disinfected, so that no absorbent pad is required as in the case of the Mark I and II patterns.The Mark III container is distinguished from the civilian respirator container by having a red band round the black lacquered body.
This example of the civilian duty respirator is stamped with a date of manufacture, here December 1941:This design of respirator continued in service with the Civil Defence into the post war period and was used throughout the 1950s and into the 60s. Of the three main designs of early war respirator (Civilian, Civilian Duty and Service), it is probably the least recognised, but served for decades, thankfully never for real.