You should invert your last pic to show the numbers which represent the preponderance which, on this 11" Dahlgren Shell Gun, was 999 Lbs. For those who
just recently joined us, the preponderance is the extra weight behind the trunnions which helps to elevate the tube for greater range. Thanks for posting these
excellent photos of this gun. Interesting information on the sign as well. The Naval Ordnance Inspector who inspected and approved this gun was Timothy Atwater Hunt
(TAH), who inspected ordnance from 1856 to 1859 and from 1862 to 1867.
Tracy