Statistics for occurrence #1 of “Mr. Porter” in chapter 1.1 of Southern Historical Society Papers, Volume 20.:

...e a different award; and the death of Secretary Mallory and Mr. Williamson, the most important witnesses in the matter, makes the possibility of a reversion apparently hopeless. As early as 1847 Mr. Porter seems to have made model of a casemated iron floating battery, and it is evident the matter was one of deep interest to him. His familiarity with the subject and his experience, ability, and ingenuit...
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