The part in bold is what doesn't necessarily make sense to me, and I cannot see how he deduced that from the foregoing. This is a small point, in view of the good info he's presented. I could get into more detail but it really isn't worth the trouble.Of note, the trunnion diameter and rimbase spacing (at 12.8 inches nearly two inches shorter than a 12-pdr Siege Gun) did not allow the howitzer to use any of the standard siege gun carriages. Also the preponderance (the excess weight of the rear of the piece) was 70 pounds – half that of the 24-pdr Field Howitzer, and even lighter than the 12-pdr Field Howitzer (which had a 90 pound preponderance). These last two details indicate the weapon was designed for use on a specific mounting within fortifications, in cramped quarters, where rapid training and elevation were called for.