plates , and then transferred to the reverse bars . The frames , floor plates , and reverse angle irons are then rivetted together at the side of the ship before they are raised in position , but some builders lay the frames across the keel before the rivetting is proceeded with . It is thought ,… … marked on , and the keel is then re - Fi g . 617 . — Keel Blocks . moved to the keel blocks , on which a , Cap piece of oak . b , Wedges . cc , Red pine . dd , Slabs . the vessel is built , and all the scarphs rivetted up . The keel blocks of red pine should be kept pretty high , more especially…
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