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

...e in not cutting down some of our heavy steamships and converting them into iron-clads. Mr. Fox bends all his energies towards introducing iron-clads into the Navy. Mr. Lenthall Chief-constructor. Mr. Isherwood Chief of Bureau of engineering. Rear-Admiral Dahlgren and his guns. Mr. Fox introduces the 15-inch gun into the Navy. Ericsson's claim as an inventor. Congress wakes up in regard to the requireme...
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