Mounted Steel Mortar
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“The mortar is a stout cannon of forged steel with simple vent firing and rear trunnions. The maximum pressure with the heaviest bomb is 16 tons to the square inch.” —Encyclopeadia Britannica, 1922
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Military ArtillerySource
Encyclopaedia Britannica (12th ed., vol. 32) (New York, NY: The Encyclopaedia Britannica Company, 1922)
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