New-York daily tribune. [volume] (New-York [N.Y.]) 1842-1866, 1849-11-24
yr Tdsane

yor IT, Th5aus
| Ocean steam Navigation. srcoSp Akr'ctE
We have seen that the fern Of a ship has
mach grestes influence upon its speed ih,n Is gen
orally supposed, snd Ia examining the financial
aspect o. The question Il viii be found tbs. there
s'e ether FssionA equally ~siehty why engineers
should sesto~ the creates, po,sibie attention apon
tie study Of models.
Let Us take, ior example the W sshiustou. srd
s1rros;ns tnG: by Al alteration ~ her hull tha
resistance which she experiences IN passing
through tina water might be- reduced one hslt e:
us see what would De the advantage to the Cen.
pany.
There srs Two modes bv winch this advantage
n got De made Gse of Toe engine might be
tanned a. lt now TO- IN which case there would be
4 E-sst increcre 81 speed, Or it might be reduced
N size II suca msune. - preserve she present
rste Of speed whi e there wozd be great Saving
Of fuel. L. tie iirst case tie erSiae beng the
same the resir:1ace being reduced 'com gro % ore
the speed vii bs increased - re inverse ratio OF
the cabe roots Of those numbers, that 10 10 ssy,
;-c@ f'ur TO ire and the ps"sse VIII he reduced
from fifteen days 10 twelve days
Ths Warrington burning forty tuns Of cos every
twenty four hours, a, four dohsrs tun. there
would be saving in three lays Of cne hundred
ani twenty tuns, say ....-....--.....-...S 'sV W
TIE space occupied BY these one hun
drsd and twenty tuns Of cosl, being fll.
ed Wit freight at tairty dollar, a tun.. $500 90
Tot.l gain on q voyage. $4,000 %
Beside the economy in provisions, and the sd
vantsss Of carrying greater number Of letters
sud OF attracting those passengers who being
pressed for Tins, now so by tie CunsrG .ino.
Ga the second superstition. the present rate Of
-
pow ersul. and "a the resistance Il reduced one
half the engine may be reduced tss ssme proportion.
This may De Effected by blowing the Tres 9TH dinish
"a power, and by making more constant use OF the
cutoff.
The ship nov consume. six auad ed tuns Of coal IN
teen days 10 this wsy three hundred Iuns rnsy b
saved, say. Low W
By replacing ,bl. with freish, a, thirty del.
lsrs the receipts may be Increased 9.CO0 60
Total gain per voyage $1,000 co
Mhen 10 10 remembered that the resistance OF tho
Northeruer IL hst that OF the Washington, aud thu,
Of the Bay State only quarter Of the Wsshngtons.
the above superstition will not ha f'gEt unreasonable
Preparations are now making 20 repair this ship,
which will not again 40 to until the 10Th OF Feb
next portion of the wooden belt which goes around
ber water line, snd which has produced no beneficial
eject. while I, 10 far from being ornamental, IL about
be removed and enlargsm eut OF the hSdiaS surface
Of tho boiler 30 be made BY this modification tho pro.
-eiors will succeed In economzings weight OF fuel
nearly equal 70 the weight OF the iron that 10 to be sd
influence upon the speed u the vessel.
The Ohio, whose speed We were made by typo
graphical error 20 set down when We bad marked II
~ Hnk-cr T. hss just arrived from svsns at Nevi ork
Ia four days and six hours The dstsncs 10 l+0 stat
uts miles and the time Of THE voyage corresponds to
a speed OF kR0ts azd 0HShRh per hour Thls 10 the
sversge speed OF = vessel which 10 twelve days and
bali Ia coming from Liverpool and ss the power OF
this ships engine 10 proportonaly double that OF the
Washington, IL plain that ia :ho construction Of the
hull neither of shoss vessels has any superiority over
tina other n respect Ct speed.
Aaoiher point desei yipg of tho most careful alien
too 10 the length of steamers There are IA the con
struct0n OF engines and NJ vessels certsin ja,AioHs
~hlch change every six or ten years as the fashion OF
ihs hat or the coat changes every Spring time. Iho
fa.hon OF building shps with great breadth OF beam,
has Of late ia vogue In England. and has bad no
itte influence IN ratarding the perfection OF Der war
steamers.
In theory steamer ought g. bs ss long as possible,
and The reason s, very clear. suppose boat with
section OF square foot n I: 10 tsn feet long will
ten cubic feet of water and will bear engine
Of certain weight II II l. twenty feet long IL will die
place double the quantity OF water, and may bear IN
CINE double tho size of the former, while In either
there Will DO but one square toot OF resistance
offered 81 the water.
Ry carrying out this mode OF reasoning II may he
perceived thar sop esnt umes longer Gnan anUtnof,
with the uHnersd Hassgs5ss ssc,tOH will be Aoe
10 bear an engine eight tn,o4 powerful, and In
consequence IL will have double the speed Inus we
clearly Why small steamers have not the speed OF
srse ones
PRACTICAL men nave UNDERWOOD lnie lntDihYoiJ
and among them there isA constant tendency to In
crease lhe length Of steamer.
The ony limit 70 ,ns strength OF the msterisls
cost too long for its breadth would Do broken In two
in heavy A. present, steamships sre buin With
length eqRsl 20 six times their bresdh. Wills river
boats been built whose length wss even Ton times
their breadth.
very remarkable experiment IL now go.ag on IN
New York 20 increase this strength Of ths m.toras
comp sting tue ship frame and we hxye no doubt~ll
have happy influence la future upon oays enteenfe
We ailude 10 TIA employment OF Iron In The Coiln'
Tine Of steamers "a thess ships ifou ghOse resistance
. tension Il great has been confined with wood 10
tbs hapyiest msuner and ,heir ssis ill thus nave
remarkable lizhtueO added 81 tbs strength OF natal
and the aexibihy Of WOOD.
Wa have lstsly visited those f1rE rDe vessels 1n-
&usnuc and the Arctic buili by Mr.. w. H. Brown.
r. s. Famed 10 receiving her engines At the Novelty
Works, aud Will 20 % sea IA February n9xt when The
Arctic Will be launched.
The Pacific snd To AntsTtio wsre 1uiis by hsssrs.
Bell Brown The fret Is receiving her machinery =,
tBe Alaire works under the ssilsul direction o. Mr
Cnss W. Copeland, and will DO dashed vhsn tbs aras
Ia lsunched-about tbs nrU OF Msroh.
VIcToR BkAUaoST, Civil Engineer.
Ne, York, Noe. H. l3i9.