This section is from the book "The Engineer's And Mechanic's Encyclopaedia", by Luke Hebert. Also available from Amazon: Engineer's And Mechanic's Encyclopaedia.
A piece of timber forming the interior of the keel, being laid upon the middle of the floor-timbers immediately over the keel, and serving to bind and unite the former to the latter by means of long bolts driven from without, and clinched on the upper side of the keelson.
 
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