The Sun.
London, England, 1868-05-27 00:00:00

711 E DUNDERBERG.

The Dunderberg, now christened the Rochanzbeau
after a hero of the American War of Independence,
was, after nine months and an expenditure of
£BO,OOO, undocked at Cherbourg ou the 11th inst.,
and we suppose is now at sea on her experimental
cruise. An account is given of her iu the Pall Mall
Gazette, which is not flattering to her builder, Mr.
W. H. Webb. The following remarks are taken from a
French journal :—" Although ten millions of francs
have been invested in her, it is the opinion of the
most competent judges that she will not be able to
hold the sea fur more than four or five years, owing
to the bad quAlity of the wood employed for her
construction." The sum paid for her. was
£294,400 delivered unarmed in Cherbourg, and the
cable messages negotiating the purchase with that
of the Onondaga, a monitor of 250-horse power,
amounted to four thousand pounds. The anchors
were said to be so bad that they were not
considered trustworthy, and were therefore re-
placed by those of French manufacture. The
engines had to be sent to ludret for repair or
alteration, several armour-plates were replaced, and
the stern rebuilt as well as the officers' quarters.
The sides of the pontoon, to a depth of Gift. below
the water, are covered with armour 3iin. thick,
secured by means of bolts extending some 20in.
into the oak planking. The plating on the battery
is 41in. thick, and the plates are worked vertically,
contrary to the usual practice. The battery is
pierced with six portholes in each side, and five in
each end, so arranged that the fire from the guns
can be delivered iu any direction, or concentrated
on a single point, and they are barely larger than
the muzzles of the guns. As we have already stated,
the .Rochambeau was bought unarmed, although two
15-inch Rodman guns, a separate purchase, were on
board of her when she arrived atC herbourg.These have
been removed for the purpose of experiment. Her
armament is, we believe, to be four rifled guns of
27 centimetres and ten of 24 centimetres, the former
throwing what may be called a 600 lb. shot. It
is stated that by means of the gear fitted to them,
which includes the Ericsson compressor, these guns
can be easily and rapidly trained. The magazines
are capable of carrying eighty rounds per gun.
The commander's cabin is situated before the bat-
tery on the lower deck, and abaft the battery are
the officers' quarters, not very spacious, and
getting their light and air from above. Between
the two is the engine, of 1,000 horse-power (no-
minal), constructed by Messrs. Roach, of New York.
This machine, which is on the reverse connecting
rod system, is fitted with surface condensers, and
drives a four-bladed screw 21 feet in diameter.
Besides this large engine there are six donkey en-
gines for working pumps, ventilating fans, &c., the
steam for all being supplied by six boilers. The coal
bunkers will hold about 1,000 tons of fuel. The
Rochambeau is provided with four boats of various
sizes, and, as is usual at present with our own men-
of-war, with a steam launch. ller crew consists of
590 men, including officers, and of this number the
machinery requires no less than 140. A letter from
Toulon describes the ship as a splendid instrument
of war, but leaking like a sieve, as much as a hundred
tons of water in 21 hours. What will Mr. Webb
say to the cause? which is stated not to be bid
construction (for the vessel is satisfmr"---1
voth for
uui irom the bad quality of
-
the wood, which is half rotten.

MAILS, &C., SOUTHAMPTON.—The Hamburgh,
American screw steamship Germania, Captain H. F.
Schwensen, from New York on the sth inst., arrived off
Cowes last Saturday, and went on to Hamburg after trans-
mitting mails, Stc., for this port. She brought 24 passen-
gers for Southampton and Havre, and 245 for Hamburg ;
$837,600 for England, $75,000 for France, $19,000 for
Hamburg, and a full cargo, including 150 bales of cot-
ton and r 55 bales of tobacco. Fine weather and light
variable winds were exporieucsd during the passage.
The following vessels were spoken by the Germania :
May 10, in latitude 44 N., longitude 49 W., ship Eliza,
AP Lauchlan ; 11th, in latitude 45 N., longitude 40 W.,
ship Lotus; 12th, in lat. 47 N., long. 28 W., bark Onyx ;
13th, in lat. 48 N., long. 23 W., French steamer
Europa, American ship Westmoreland, English ship Orilla,
and brig Chanticleer; and off the Start, the Hammonia
steamer, from Southampton for New York. The steam-
ship A trato, Captain R. Revett, left this port on Monday,
with the West India and Pacific mails; the America,
Captain G. Ernst, on Tuesday, with mails for New York ;
the Teutcmia, Captain A. Baronds, on Friday, with mails 0
for New York.

A Western inventor announces a steam-engice
on an entirely now principle. By condensing the steam,
thus forming a vacuum, water is raised about 30 feet, and
allowed to fall on an overshot wheel. The invention is
said to promise good results, as a safe, "cheap, and highly
efficient power.

The lifeboats furnished by the United States Go-
vernment to the ports on the lakes, have, it is alleged,
been suffered to decay through neglect. The recent dis-
aster of the Sea Bird has called attention to these facts,
and the Custom-house officers are advised to make appli-
cation for new boats, and to take better care of them in
the future.

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