Engineering Wonders of the World
Volume I
Forfatter: Archibald Williams
År: 1945
Serie: Engineering Wonders of the World
Forlag: Thomas Nelson and Sons
Sted: London, Edinburgh, Dublin and New York
Sider: 456
UDK: 600 eng - gl.
Volume I with 520 Illustrations, Maps and Diagrams
Søgning i bogen
Den bedste måde at søge i bogen er ved at downloade PDF'en og søge i den.
Derved får du fremhævet ordene visuelt direkte på billedet af siden.
Digitaliseret bog
Bogens tekst er maskinlæst, så der kan være en del fejl og mangler.
354
ENGINEERING WONDERS OF THE WORLD.
Fig. 10.—LONGITUDINAL SECTION OF CARGO STEAMER, SHOWING
ends unsupported ; and (2) with the hollow of
a wave amidships, and each end of the ship
resting on a wave, the wave in both cases
having a length equal to the ship’s length
and a height of one-twentieth of the length.
The distribution of longitudinal material
will be seen from the comparative sections of
i he Lusitania and Great Eastern (page 318), and
from Fig. 6, which illustrate
. the structural design ot the
Design.
Atlantic liner Lusitania and a
cargo steamer respectively. It will be noticed
how the “ topsides ” and deck are thick-
Fig. 7.—SECTION OF A DOXFORD “TURRET” FORM
STEAMER, WITH LARGE CLEAR HOLD.
ened up to form the upper flange of the
girder (amounting to no less than 2 to 2£
inches in the case of the Lusitania), while
the bottom plating and tank top plating form
the lower flange. The framing which supports
the outer shell usually consists of transverse
girders spaced not more than 2 to 3 feet
apart. In passenger vessels, where numerous
decks are required for the accommodation,
the side frames are comparatively small. In
cargo steamers, however, where large clear
holds are essential, the intermediate decks or
tiers of beams are dispensed with wherever
possible, and larger frames, known as “ web ”
frames and “ deep ” frames, are fitted. With
the same object in view, various patented
forms of ship have been designed during late
years, of which the most widely adopted—
Doxford’s “ turret ” form—is shown in Fig. 7 ;
while another type—Harroway and Dixon’s
cantilever framed ship—is shown in Fig. 8.
Various systems of longitudinal instead of
transverse framing have been suggested at
different times, a notable example of the
application of this principle being, as already
mentioned, the Great Eastern. Lately the
system of longitudinal framing has been re-
vived in the case of several cargo steamers—
it is claimed with a considerable reduction