Statistics for occurrence #1 of “Lieutenant Brooke” in chapter 1.1 of Southern Historical Society Papers, Volume 19.:

...r. Porter approved of the plan of having submerged ends to obtain the requisite flotation and invulnerability, and the Department adopted the design, and a clean drawing was prepared by Mr. Porter of Lieutenant Brooke 's plan, which that officer then filed with the Department. The steam frigate Merrimac had been burned and sunk, and her engine greatly damaged by the enemy, and the Department directed Mr. Williamson...
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† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.