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

...e first of which made seventeen and one-half knots per hour for twenty-four consecutive hours, the greatest speed that had been attained at that time by any naval power. In this case the ability of Mr. Isherwood , chief of Bureau of Steam Engineering, was brought into play. He designed the engines and boilers of these ships, as he did the machinery of all others planned by Mr. Lenthall. Mr. Lenthall cou...
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