Helmet-type gas mask, United Kingdom, 1915
The flannel mask could be worn over a helmet and tucked into a uniform. The mask has glass eyepieces so the soldier can still see. The mask is known as the PH British anti-gas hood. PH stands for phenate hexamine, a solution used to provide protection during a phosgene or chlorine gas attack. Phosgene gas was particularly dangerous as it is colourless and almost impossible to smell. The gas affects the lungs and can cause heart problems. Symptoms appeared within 24 hours.
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Glossary: gas mask
A respirator that contains a chemical air filter and is worn over the face as protection against toxic gases and aerosols
Glossary: phosgene gas