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The parts of each frame must either be bolted or tree-nailed together, and the laps in vessels of 200 tons and upward shall not be less than two feet six inches, and joints well fitted. Each frame to be secured to the keel by three bolts, one bolt through the floor and keel, and the others through the keelson floor and keel.
The butts of the timbers to be close, and must not be less in thickness than one-third of the entire moulding at that place, to be well chocked with anchor chocks. When the ends of timbers are full size, chocks are dispensed with.
Chocks between frames may be used instead of solid frames but the chocks must not be less than three feet in length, and not less than two and not more than three inches thick. But in no case can a reduction of size or increase of space between centres of frames be allowed. The cant frames must be framed square with the planking, and must be stepped into the dead wood and bolted through.
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