Steam-ships : $b The story of their development to the present dayFletcher, R. A.
History
Steam-ships : $b The story of their development to the present day
Fletcher, R. A.
Shipbuilding; Steamboats
A somewhat similar dock to that at Bermuda, slightly shorter but of
greater lifting power, was designed for the Navy Department of the
United States of America, and constructed by the Maryland Steel Company
at Baltimore, and stationed at Algiers near New Orleans. Its length is
525 feet over blocks, its entrance 100 feet, and its lifting power up
to pontoon-deck level no less than 18,000 tons, making it as regards
lifting power then the most powerful dock in the world. This lifting
could be increased to 20,000 tons by using the “pound.” Its hull weight
is 5850 tons.
[Illustration: SELF-DOCKING OF THE BERMUDA DOCK (WELL HEELED).]
[Illustration: BERMUDA DOCK: CENTRE PONTOON SELF-DOCKED]
It is interesting to note the different methods adopted by the
Governments of the two countries for the shoring or berthing of the
ships on the dock. The English custom in the case of ironclads of the
pre-_Dreadnought_ era, and also that of Italy and Japan, is to support
the armour belt on more or less vertical shores inserted under an
angle-iron firmly attached to the belt.
These shores are put into position as the ship is rising, and, as the
water recedes, more and more shores are inserted. The Bermuda dock
has large and heavy altars constructed for this purpose. The American
custom is to strengthen the bilges of their ironclads with strong bilge
docking keels, forming, with the keel proper, a level bottom. No shores
are required beyond those necessary to centre the vessel, and no great
care is required in adjusting the berth, and one set of bilge blocks
does for all sizes of vessels. The American plan affords a great saving
in weight and quantity of shores, and, what is more important, a great
saving in time, not only in the preparation of the berth and centreing
of the ship, but also in the actual lifting. With the American plan it
would be perfectly feasible to dock a vessel completely in the time
required to centre and adjust her with shores disposed according to
English practice.
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