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

... ordered Chief Engineer Williamson and Constructor Porter, from the navy yard at Norfolk, to Richmond, about the 23d of June, for consultation on the same subject generally, and to aid in the work. Constructor Porter brought and submitted the model of a flat-bottomed, light-draft propeller casemated battery, with inclined iron-covered sides and ends, which is deposited in the Department. Mr. Porter and Lieutena...
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