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Masked Cyclist Sounds Gas-Attack Warning (1936) -- Sounding a loud alarm through a loudspeaker clamped to the handlebars of his bicycle, a masked rider wheeled through London streets recently, like a modern Paul Revere, to test the efficiency of a new method of warning the public against sudden aerial gas attacks in war time. Equipped with gas mask and respirator, the cyclist broadcast warnings through a microphone built into the mask and wired to the battery-operated loudspeaker.