A photograph showing a 12" sliding railway mount used by the government during World War One. The mount weighs approximately 600,000 pounds and is 105 ft. long. It shoots a 700-pound projectile at a muzzle velocity of 3250 ft. per second, reaching distances of 28 to 30 miles. The image is labeled "FOR OFFICIAL USE ONLY."

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Size: 8412px × 5734px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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