Photograph from the Illustrated London News entitled: ‘The Modern man-at-arms: like a familiar of the inquisition – a British soldier in the new gas-mask’, 11 December 1915. This was one of the earliest types of “P.H”, gas mask hoods. They were replaced by box respirators, see the Instruction leaflet for box respirator in our document collection part (2), (Catalogue ref: ZPER 34/147)