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

...ief-Engineer Williamson and Constructor Porter, from the navy-yard at Norfolk, to Richmond, about the twenty-third 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 case-mated battery, with inclined iron — covered sides and ends, which is deposited in the department. Mr. Porter and...
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