The Eleventh Improvement
Consists in making the sheaves of ships' blocks in a different manner from
what is usual, by which improvement the ropes will run easier, and the blocks
will be less expensive to make -- and I accomplished it by placing a
brass or other metal tube in the centre of the sheave, and then running molten
lead, or other soft metal, into notches or groves between the tube and the
sheave, so as that when the lead cools, the tube is prevented from starting
from its position until entirely worn out.
. . .
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