The 20th Imrovement
Consists in making the lower masts of large ships in two or more lengths of
wood, inserting the small end of one length into a deep square socket of
another length, and then placing a long wrought-iron cylinder over the joint
-- screw-bolting the upper and lower ends of the cylinder to the wood, to
prevent the mast from twisting.
An iron cylinder placed round the hold-part of every lower-mast, would
serve the doubly useful purpose of encasing the mast without taking up much
room, and of enabling the mast to be lengthened, should the mast-head decay or
be carried away.
Shipwreck and Collisions at Sea greatly prevented by Christophers' Patent Improvements in Naval Archtecture. With four plates.
London: J. Olliver, 59, Pall Mall; P. Richardson, 23, Cornhill. Liverpool: Deighton & Laughton. M.DCCC.L. 8vo, (4), 112 p, 4 pl.
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Copyright © 1996 Lars Bruzelius