Net in Ceiling Rings Alarm if Fire Bomb Hits Roof

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Part of Net in Ceiling Rings Alarm if Fire Bomb Hits Roof

Immediate warning will be sounded in one London store if an incendiary bomb should fall on its roof. Slung below the ceiling of the top floor a net completes an electric contact to ring the alarm bell as soon as any object penetrates the roof.

Title (Dublin Core): Net in Ceiling Rings Alarm if Fire Bomb Hits Roof