Statistics for occurrence #1 of “Mr. Porter” in chapter 84, page 279 of Rebellion Record: a Diary of American Events: Documents and Narratives, Volume 4.:

...lliamson and Mr. 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 ...

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