Statistics for occurrence #1 of “Secretary Welles” in chapter 32 of Admiral David D. Porter, The Naval History of the Civil War.:

...nd cast some guns of that size, somewhat on the Dahlgren pattern. Whether the Naval Ordnance Department knew of the casting of this 15-inch gun we are not prepared to say, but it is certain neither Secretary Welles nor Mr. Fox knew anything about it until after the battle of the Monitor and Merrimac. The account of the destruction of the Cumberland and Congress had been flashed over the wires to the Secreta...
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