The Sun.
London, England, 1866-04-19 00:00:00

CHESTER.

SPRING FASHIONS, for Gentlemen's Overcoats,
Morning Coats, Trousers, and Vests.

BOYS' NEGLIGE, and other suits, HIGHLAND
DRESS, KNICKERBOCKERS, &c.

LADIES' RIDING RAMS, JACKETS, OVER-
COATS, CLOAKS, &c.

H. J. and D. NICOLL'S GUINEA WATERPROOF
TWEED COATS for Gentlemen, and CLOAKS for
Ladies, are patronised by Travellers all over the world.

J. and D. NICOLL, 114, 116, 118, 120, Regent-
street ; 22, Cornhill, London ; 10, Mosley-street, Man-
chester ; and 50, Bold-street, Liverpool.

CIONSERVATIVE LAND SOCIETY.— DE-
N...) POSIT DEPARTMENT.—Persons wishing to in-
vest in the Conservative Land Society without becoming
members thereof may deposit sums daily at the Norfolk-
street, Strand, offices. The present rate of interest is four
per cent. per annum, payable half-yearly. On all deposit
accounts not exceeding £lOO withdrawals will be paid
every Wednesday. From £lOO to £5OO, twenty-one days ;
and on larger sums than £5OO, one month's notice. Each
depositor will receive a deposit account book, which must
be produced at the office whenever any money is paid in or
paid out. Prospectuses sent free of charge.
CHARLES LEWIS GRUNEISEN, Secretary.
Offices-33, Norfolk-street, Strand, London, W.C.

JOHN GOSNELL and CO.'S CHERRY
ty TOOTH PASTE-is greatly superior to any tooth
powder; gives the teeth a pearl whiteness, protects the
enamel from decay, and imparts a pleasant fragrance to
the breath. Price Is. fld.—Red Bull Wharf, 93, Upper
Thames-street. London.

TEETH AND PAINLESS DENTISTRY.-
The fear of pain and dread of operation inherent to all
deter very many to whom ARTIFICIAL TEETH are of
vital importance from availing' themselves of the services of
a dentist. In a practice founded in 1830, and now extending
over greater part of the kingdom, an experience unequalled
has been obtained, enabling us to offer even the most sensi-
tive sufferer a system of dentistry perfect in its absolute
freedom from pain, a specialitd t ertaining only to our prac-
tice, and for which her Majesty has granted her royal letters
patent. This system embraces the non-interference with all
stumps, however decayed, the supporting instead of extrac-
tion of loose teeth until they become firm and useful in mas-
tication, and the utter absence of all and every operation, so
that the most nervous person can be supplied without tear of
pain or inconvenience. These teeth are cheaper, more dur-
able, natural, and comfortable than any yet produced.
Consultation free. Teeth from ss, Sets from 5 to 25 ga.,
warranted.

For the efficacy, utility, and success of this system, vide
" Lancet." _

Messrs. LEWIN and SIMEON MOSELY and SONS,
30, Berners-street, Oxford-street, and 448, Strand,
Opposite Charing-cross Railway Station.
Daily attendance at 15, Whitefriargate, Hull; 10, Norfolk-
street, Sheffield; 4. East-parade. Leeds; 14, St. Nicholas-
street, Scarbro' ; and 33, Coney-street, York.
.• • • -

Established 1830. No connection with any one of the same
name.

Her Majesty's Ship Pallas.

Following upon the contractor's trial of her ma-
chinery on the 11th inst., and in accordance with the
arrangements of the Controller of the Navy, the
armoured screw corvette Pallas, 6 guns, 2,372 tons,
600-horse power, Capt.MatthewConnolly, made her
trials of speed with full and half-boiler power, at
her sea-going draught of water, over the measured
mile in Stokes Bay, near Portsmouth, yesterday,
the results being satisfactory in the highest degree
as regards the machinery of the ship, but not quite
so satisfactory in relation to the ship herself, if the
rate of speed she attained with full-boiler power is
in conjunction with the extraor-
dcoinnasridyeporedw
seirinydpelveloped by her engines and the im-
mersed area of her midship section or displacement.
The Pallas is 225 ft. in length between perpendicu-
lars, with an extreme breadth of 50ft. On leaving
Spithead for Stokes Bay yesterday morning her
draught of water was—forward 18ft. and aft
24ft. lin. The height of her gun deck from the
water-line was, at the bow port cill, 10ft. ;at central
battery port tills, Bft. ; at after port cill in the
captain's cabin, Bft. 9in.
The propelling power of the ship consists of a pair
of engines, manufactured by Messrs. Humphreys
and Tennant, of the collective nominal power of 600
horses. The specifications of the Admiralty in their
contract for these engines, as also for those ordered
at the same time for the Bellerophon, Lord Clyde,
and Lord Warden, stipulated that they should
exert six times their nominal power with boilers of
the size usually employed by the Admiralty—viz.,
19ft. of heating surface and 7-10ths of a square foot
of fire-bar to the nominal power. The boilers of the
Pallas, therefore, have 11.400 square feet of heating
surface, and 420 square feet of fire-bar. As the
source of power in all engines is the coal burnt, and
as all boilers supplied to the Admiralty are as nearly
alike in their proportions as possible, it follows that
the quantity of coal burnt will be in direct propor-
tion to the size of the furnaces—i.e., to the area of
fire-bar—and hence the perfection of the engines
of the four ships must be measured by their de-
velopment of power, if all other things can be ren-
dered equal. The engines of the Pallas are built
on the system known as " Woolf's," each engine
having two cylinders—the smaller one, into which
the steam first enters from the boilers, being 51in. in
diameter, and the large cylinder, into which the
steam expands from the smaller one, having a dia-
meter of 102 in. The length of stroke with both is
3ft. 3in., and the contract speed is 75 revolutions
per minute. The surface condensers are of the kind
introduced by the late Mr. Samuel Hall in 1830,
and are of sufficiently ample dimensions to condense
all the steam generated by the boilers, and without
the aid of injection water. The engines drive a
two-bladed Griffith screw with a diameter of 18ft.
6in., and a stroke of 18ft. The weather was beau-
tifully fine and favourable for the occasion, the
wind being very light and variable in direction, with
the sea as smooth as a glass mirror. The officials
and others on board comprised Rear-Admiral G. G.
Wellesley, Mr. E. J. Reed, Chief Constructor of
the Navy; Commander Brett, of her Majesty's ship
Asia, Steam Reserve officer in charge of trial; Capt.
Herbert of her Majesty's ship Royal Sovereign ;
Messrs. Murray and Ward, steam factory depart-
ment ; Mr. Murdoch, Steam Reserve department ;
Mr. Brain, assistant-master shipwright ; Mr. H.
E. Humphreys, master of the ship's engines, &c.
Six runs were first made with full boiler power
with the following results :—speed of the ship, knots.
—lst, 14.220; 2d, 11.465; 3d, 15.000; 4th, 10.942;
sth, 15.254 ; 6th, 10.778. Ship's mean speed,
13.057. Steam pressure, 311 b. ; average vacuum,
2 engines per
320, 441, 317, 438.
F
per minute, 81, 81,81,
82,75,1 Bolu n.
r 8 R
runs e
337,b0i1er power gave the follow-
-Speed of ship, knots.-Ist, 12.457 ;
ioiv ;olup
wteiirto h run,ias o f
half e n
4
follow-
ing
figures
:
; 3d, 11.880 ; 4th, 10.778. Ship's mean
speed, 11.077 knots. Indicated horse-power cf
engines, 3,768.
The rudder, with the ship motionless, can be put
over to an angle of 35 deg. each way.
The engines worked in a most astonishingly even
and satisfactory manner during the whole of the 10
runs, maintaining their 80 revolutions' speed and up-
wards throughout the full-power runs in a manner
never before excelled. Some little delay took place
at the commencement of the trial from the boilers
priming,s which, however, was soon got
smoothly enough afterwards.
T
thNe'ebotw waves, as comparedwith those
ship's submerged beak on the 1 lth inst.,
unexpectedlyo
raisedvh eor,
, height and
by
the al
of l ln
was about Ift. less, and none of the bow watermade
entry, as on the previous occasion, by the vessel's
hawsepipe. This difference in height and volume of
bow water was owing to the fact of there being no
movement of the sea yesterday, whereas on the for-
mer trial there was movement. The ship carries two
distinct waves, it may be said, in front of her mid-
ship section, one being the great bow wave thrown
up by her beak, and the other rising under the after
part of the fore channels, a chasm of water separat-
ing the two. At half-boiler power these waves were
reduced to one-fourth of their size as exhibited with
full-boiler power. The ship steered remarkably easy,
half a spoke of the wheel throwing her instantly off
in the direction desired.
A careful and impartial analysis of the trial figures
will bring out the following important inferences :
1. The indicated horse-power And revolutions of