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All vessels above 150 tons, to have Assistant Keelsons, fastened with two through bolts to each frame, and clenched on the under side of frame, besides being fastened with a through bolt, through main and assistant keelsons between each frame, and clenched.
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| Fig. 1 Midship Section of a Sail Vessel about 500 tons. |
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| Fig. 2 Section of keel and pock-pieces at opening of centrecase. |
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