By the turn of the century, it had six gun pits and two machine-gun posts. Its main ordnance seen in the photo was a 6-inch 5-ton breach-loading Armstrongs, called disappearing guns, which could be raised rapidly to fire over the Fort's ramparts and lowered below the parapet just 20 seconds later. My friend German Prekel,being a mechanical engineer, admires the originality of the design.