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

...June 23d, Constructor Porter brought and submitted the model of a flat-bottomed, light-draught propeller, casemated battery, with inclined iron sides and ends, which is deposited in the department. Mr. Porter and Lieutenant Brooke have adopted for their casemate a thickness of wood and iron and an angle of inclination nearly identical. It is to be presumed that, inasmuch as the Secretary notes this simi...
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