Hypo helmet

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A Hypo helmet is a flannel bag, with eye-pieces of mica soaked in some anti-gas solution, one of the first used being a hypo (sodium thyosulphate) solution. The hypo helmet superseded the cotton-pad respirator. The first one was made on May 10th, 1915, and is preserved at the Imperial War Museum.[1]

See also PH helmet.

References / notes[edit]

  1. Edward Fraser and John Gibbons (1925). Soldier and Sailor Words and Phrases. Routledge, London p.125.

Glossary of terms[edit]

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