This early hospital gas mask was designed for use by wounded patients lying on cots or beds in medical facilities near the front lines during the First World War, where gas attacks were a constant threat. Unlike standard soldier respirators, this mask addressed the urgent problem of protecting men who were immobile and unable to fit or manage a mask themselves.
The hood-like construction allowed the mask to be slipped over the head of a prone patient and tied securely at the neck, preventing it from sliding off. It incorporated components associated with the German Model 17 “Ledermasken”, including reinforced eyepieces (“spiders”) and the later-war Model 17 third-pattern filter canister.
Why it mattered
Poison gas warfare did not stop at the trenches. Casualty clearing stations and forward hospitals often lay directly in the path of drifting gas clouds. Wounded men—many unconscious or severely injured—were especially vulnerable. This type of hospital mask provided passive respiratory protection, buying time during an attack when evacuation or movement was impossible.
How it was used
The mask was intended to be applied by medical staff, not the patient. When gas was detected, the hood could be pulled over a patient’s head while they remained lying down. It was typically secured around the neck with an attached cloth lace or string, helping keep the mask in position during treatment or while staff managed multiple casualties.
How it worked
Breathing air was routed through air-purifying filter cartridges, offering protection against common chemical agents. Later iterations of this protective concept used cartridges filled with agglomerated coal and glycerin water, improving filtration efficiency as gas warfare evolved.
Design and construction
The mask uses a fabric hood fitted with a mica eyepiece for visibility. The eyepieces were reinforced with metal “spiders,” a feature characteristic of German gas mask designs of the period. While innovative, the construction was relatively fragile, required careful handling, and demanded training to use effectively. In practice, the mask could restrict movement and immobilize the wearer during an attack, as patients and attendants worried about the mask becoming dislodged.
Development and evolution
In response to early gas attacks, notably following the German use of poison gas at the Second Battle of Ypres on 22 April 1915, the British Army rushed improvised protections into service. These included cotton wool pads wrapped in muslin and the Black Veil Respirator, a chemically treated cotton pad secured over the mouth.
Seeking improvement, Colonel Cluny Macpherson CMG FRCS developed a hood-style mask made from chemically treated fabric that fitted over the entire head. His design used a canvas hood approximately 19.9 in × 18.9 in, treated with chlorine-absorbing compounds and fitted with a mica eyepiece. Macpherson presented his concept to the War Office Anti-Gas Department on 10 May 1915, and it was adopted as the British Smoke Hood in June 1915.
Subsequent refinements led to more advanced respirators, including the ARS mask (Appareil Respiratoire Spécial) or MCG (Masque contre les Gaz), engineered in August 1916, produced in January 1917, and entering service in January 1918. These later masks offered improved protection through better seals, elastic straps, and evolving filter technology, and represented the most effective Allied gas protection available at the time.
Manufacture
United Kingdom, incorporating design elements inspired by captured and studied German gas mask technology.
Dimensions
Approximately 20 in × 19 in
