Statistics for occurrence #1 of “Mr. B. F. Isherwood” in chapter 39 of Admiral David D. Porter, The Naval History of the Civil War.:

...vements and additions of ships, Mr. Welles wisely approving all his suggestions; while the able Chief Constructor, Mr. John Lenthall, brought all his ability to bear on the models of the vessels, and Mr. B. F. Isherwood , the talented Chief of the Bureau of Steam Engineering, devised the engines, which, even to the present day, have scarcely been equalled. The consequence of all this was that Governments disposed...
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