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National Geographic : 1919 May
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A COASTAL AIRSHIP IN THE HANDS OF A LANDING PARTY, SHOWING A GUN MOUNTED ON TOP OF THE ENVELOPE Before the use of helium as the lifting gas of dirigibles, it was a dangerous practice to mount a gun on top of the bag for defense against air plane attacks. A single spark from the muzzle, touching and igniting the envelope and exploding its contents of hydrogen gas, would have been sufficient to reduce this mammoth flyer to a tangled heap of useless rubbish.
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