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LENGTHENING
LENGTHENING, the operation of cutting a ship down across the middle, and adding a certain portion to her length. It is performed by sawing her planks asunder, in different places of her length, on each side of the mid-ship frame, to prevent her from being weakened too much in one place. The two ends are then drawn apart, to a limited distance, which must be equal to the proposed addition of length. An intermediate piece of timber is next added to the keel, upon which a sufficient number of timbers are erected, to fill up the vacancy produced by the separation. The two parts of the kelson are afterwards united, by an additional piece which is scored down upon the floor-timbers; and as many beams as may be necessary are fixed across the ship in the new interval. Finally, the planks of the side are prolonged, so as to unite with each other, and those of the ceiling refitted in the same manner; by which the whole process is completed.
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© Derived from Thomas Cadell's new corrected edition, London: 1780, page 176, 2003
Prepared by Paul Turnbull
http://southseas.nla.gov.au/refs/falc/0801.html