Steamships and their storyChatterton, E. Keble (Edward Keble)
History
Steamships and their story
Chatterton, E. Keble (Edward Keble)
Shipbuilding; Steamboats
It is easier to balance four cranks
than three, and in this German ship the four-crank principle is
followed. Steam is supplied by four single-ended and eight double-ended
boilers, the Howden draught system being employed.
The _Berlin_, the other latest modern liner of the Norddeutscher Lloyd
Line, will be seen in the next illustration. Unlike her sister, she
has been given only two masts, and in another illustration, in a later
chapter, we show this ship under construction. She was recently built
at Bremen for the Mediterranean to New York service, and carries 3,630
persons, inclusive of crew. Like other modern German liners, this
vessel is handsomely furnished, and the public rooms are all united
in a deckhouse lighted by a large number of cupola-shaped sky-lights.
She has a registered tonnage of 19,200 gross, and in the Norddeutscher
fleet ranks next after the _Kaiser Wilhelm II._ She passed into the
hands of her owners at the end of 1909.
[Illustration: THE “LAURENTIC” ON THE STOCKS.
_From a Photograph. By permission of Messrs. Harland & Wolff._]
Two interesting new ships were commissioned in 1909 by the White
Star Line, for the Liverpool-Quebec service, named respectively the
_Laurentic_ and _Megantic_. An illustration, showing the former on
the stocks at Harland and Wolff’s yard, Belfast, is given opposite
page 210. The _Laurentic_ and _Megantic_ are, as to hulls, sister
ships, and each has a tonnage of 14,900, thus being among the largest
steamers in the Canadian trade. But whilst the latter is a twin-screw
ship propelled by reciprocating engines, the former has three screws
and a combination of reciprocating engines and a low-pressure
turbine, being the first large passenger steamship to be designed
with this ultra-modern method. Each of the “wing” propellers is
driven by four-crank triple balanced engines, the central propeller,
however, being driven by the turbine. The object aimed at by this
novel hybrid method was to retain the advantages of the carefully
balanced reciprocating engines, but at the same time to obtain the
benefit of the further expansion of steam in a low-pressure turbine,
without having to employ a turbine specially for going astern. The
reciprocating engines of the _Laurentic_ are adequate for manœuvring
in and out of port, and for going astern, since they develop more than
three-quarters of the total combined horse-power. This steamship,
single-funnelled and two-masted, measures 565 feet in length, and 67
feet 4 inches in width, and besides having accommodation for 1,690
passengers, carries a large quantity of cargo. Like many other big
steamships that we have noted in the course of our story, she has a
double cellular-bottom which extends the whole length of the ship,
being specially strengthened under the engines. Her nine bulkheads
divide her up into ten water-tight compartments. It will be noticed
that the rudder has gone back to the ordinary type common before the
introduction of the balance method.
Public-domain text, read in full here on John Shaqi.
Reviews
Reviews
No reviews yet
Be the first to share your thoughts on this work.
Elsewhere in the archive
Join the Discussion
Join the discussion
Sign in to leave a comment or review.
Sign InorCreate an account