Statistics for occurrence #1 of “Lieutenant John M. Brooke” in chapter 1.35 of Southern Historical Society Papers, Volume 34.:

... with two layers of iron that was rolled at the Tredegar Iron Works in Richmond. The plates were 8 inches wide, 2 inches thick, and about 20 feet long. Their capacity for resistence was tested by Lieutenant John M. Brooke , of the ordinance department at Richmond. The first layer ran fore and aft, and the top layer was placed up and down. The timber backing was 22 inches thick and the iron armor 4 inches. Her shutt...
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