Hypo helmet

Hypo helmet
Indian troops wearing Hypo helmets in a posed photograph, August 1915
TypeGas mask
Place of originDominion of Newfoundland
Service history
In service1915–1918
Used byUnited Kingdom
India
Dominion of Newfoundland
WarsWorld War I
Production history
DesignerCluny Macpherson
Designed1915
No. produced2,500,000

The Hypo helmet, or British Smoke Hood (its official name), was an early British World War I gas mask, designed by Cluny Macpherson.