Edgefield advertiser. [volume] (Edgefield, S.C.) 1836-current, 1843-04-05
MISCELLANEOUS.
Fronl tie Boston Ersniag BaNttin

!Schrew PropeAsr.-This new Invention,
as applied to ocean steam navigation. is
attracting much attention, at The present
time. in the Old Work. 81,
We kavc been farafEd with a periisal
OF private letters received ny The Acadia,
giving an account OF The triumphnn, sue
cess OF this screw propeller in a rcccnr en-
pcrimcn;al trip of the new Steam Frigate
'Gregt Norhcrn." from Londonderry to
LonGou. This account would seem to
establish, beyond Il doubt. the fecl. that
the ocean caa be navisaied by screw pro-
PEELED vessels. not only with more speed.
but also By a smaller engine inon usual.
and with much legs fuel. Daring the lime
Of favorable winds. they can Rp under
canvass alone, and by The absence OF The
clumsy site boxes and wheels, be much
less exposed 10 damage. IN the expert.
mer'aI trip referred To-, the Fisasr. by
the joint application Of Steam and sails,
made. for several successive hours. with
favorable but light wind. thirteen and "a
hall miles rer hour, while The greatest
speed yet G;inincihy the British aud Nurih
American Mail Steamers. is said 10 have
heen from clcyen 10 eleven and n bali
miles per hour. Tie wriier adds-"When
We consider that These steamers, built ex-
p@ressly for mai! aud speed, have four hun
dred and fEy horse power engines for n
tonnage Of twelve hundred ious, while the
Great Northern. Is a heavy man of war.
is propelled only hy three hundred mud
sixty horse power for the capacity of two
thousand ions-'hr advantage ofihe screw
propeller over Tho paddle wheels, is clear
IS proved. and The grca. problem OF The
combination of sail aud steam navigation.
appears IL hc now solved. Our speed with
steam alnnc, Hgains, n contrary breeze.
was eight and n half miles per hour /: with
sails alone. eiIhout steam, from eight TO
tel miles, as The winl changed ffom norih-
west 10 east north east"
Tie success of this tria! rcnevs our
hopes tha, t5c !;ar Ct; steam ships may
soon he established between The Continent
Of Europe and this port. which Mr.. Charles
K~cutsen. from Germany, had in view
during his visit 10 this country las, sum-
mer. bot which wns delayed by The un-
certainty Of The success of lbe screw mp
plicaiion on q larger scale than had been
Iried III that time : and as Mr.. keutsen.
after Il minute examination OF The iocaii-
ties aud other interests Of The ports Of Bos-
Ton and New; York, seemed TO give The
preference decidedly to Boston, we have
no doubt bul thar the energetic cSrrIions
Of this gentleman vii! result in our pom
being IN q short time visited by the FIRST
large screw steamer from The Continent Of
Europe.
Wo find in tho London Examiner, n
fnIl description of the Grea, Northern.
The propeller used in this splendid YES
sci. is divided in,otwo half turns. its length
being seven feet, and tia diameter eleven.
This screw it placed IongiIudinally in a
hole Gu, in he lradwonl Immediately be-
fore The rgdder. the keel being continued
along under The screw, BY tiisconnecling
The screw. which is the work Of q minute,
the ship hccon,cs. TO all iu'cuis anl pnr-
poses a smiling vessel. As to the velocity
auainable by The screw propeller. Captain
Chappel!, in his Official report on The sub
lcct. published in 1889. by Riisway, OBJ
serves Tho whole force Of the screw
brins directly peopulsive in n line with tho
ships keel. by ousmeniirs TIC velocity Of
The screw. | sec no other Limitation To the
speed of the vessel than such rs is offered
by the screw. which shows that the rcsis-
lance increases Us the square Of the velo-
CITY,"
The Grca, Northern is fully rugged rs a
sailing vessel, aud spreads six thousand
and seven hundred yards Of convass-her
length, between perpendicr!ars, is two
hundred and twenty-five feel. the length
over al, two hundred and (crsy-sevcn
feet breadth Of beam. ihirty-seven feet /:
depth of hold. twcnty-six fee: dausht OF
water. with one thousand aud three hun
drcd tons dead weight, sixteen feet /; ton
mage, Que thousand five hundred and fif-
teen. new measure; nominal power at the
engines, three hundred and sixty tho
diameter Of the cylinders, sixty-eight feet;
length Of stroke, four fee, six inches; rcvo-
~lutions per minute: from sixteen 10 seven
tecG ; diameter of the screw, eleven feet.
The steam power, in this case, however,
may be considered as auxiliary only IN
the sailing; for with sails alone. The vessel
has been found to run easily from twelve
TO thirteen knots an hour, or between four
teen and fifteen statute miles. The roy-
age 10 Calcutta, for Instance. by these
combined advanrages-the sails coming
in 10 increase the speed and save The coal,
when smiling is preferable. aud the fire be-
lug kept alieht whcnihc ordinary power
of the sails is comparatively po@crlcss-
would be reduced TO a run Of some fify
days, as there would he no maneuverins
or going out Of the way 10 accommodate
trade winds, or catch the slant, and no
putting IN every here aud there. a, out Of
tho way places, Cor coal-for one cargo of
coal Of four or five hundred tons-lhcre
being s'owase, however, for six hundred