All vessels of 170 feet in length and upward, to have Diagonal Iron Plates closely inserted outside the frames, at an angle of not less than forty-five degrees, their lower ends pointing to the after end of the keel in the afterbody, and to the fore end in the forebody, four pairs crossing each other amidship, and to extend from the upper side of deck beams to two feet below floor heads amidship, and to the same perpendicular height forward and aft, measured from the lower part of keel. Plates to be not over six feet apart and fastened with one bolt to each frame. The size of plates to be not less than as follows, viz:

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