Air-Raid Vault Uses Chain of Gas Masks (Aug, 1939)
Air-Raid Vault Uses Chain of Gas Masks
Like smokers grouped around a Turkish bubble pipe, users of a new French air-raid shelter inhale from a common source. Tubes connect their masks with a single pipe leading from a battery of oxygen cylinders, as shown above. Thus they are constantly assured of pure air to breathe, without recourse to poison-absorbing canisters that hinder free respiration; and elaborate gasproofing precautions may be dispensed with.