All vessels must have Bilge Strakes, their collective breadth to be equal to one-sixth the vessel's beam, and every strake must be fastened with two through bolts to each frame, and clenched.

Bilge strakes in vessels of 200 tons and upward, must be edge-bolted in every strake between each frame. They must be well fitted to the frames, and edges beveled to good caulking seams. All joints must be hook or key scarphed.

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