New-York daily tribune. [volume] (New-York [N.Y.]) 1842-1866, 1849-10-19
yywyonK FRIDAY MORNING. OCTOBER 10. Isas.
Ocean steam Navigation.

We publish below an Interesting article on this
topic. from 81 Intelligent scientific msu residing
in this City. The ssures he gives are curious and
instructive. al his remarks display thorough
kAox.edgs q his subject. We trust hrs idea
with regard to the ships now building may be
proved erroneous. bot have learned not to be TO
ssnsuine 10 our hopes
7, tis Eia--s = TIE Trisarss
In ai;euii7eiy examining Tire msgn-hceni steamboats,
Of TIE Hudson and the sound csn scarcely help
bsng ds1zed By the grestness Of the establishments
10 which such vessels 5eloag snd when Ne look into
the minute technical details Of their construction cur
admiration e increased. and We are ready 10 believe
that some grand secret Of naval Architecture unknown
90 c-her nations. must have 5een revealed 10 the build
ers and engineers OF America.
But this Is By no means the whcn Ne leave the
navigation OF the rivers and coasts for the Ocean
There are ssiouish-d At the outset by the super
orty oi the English IBIS Ia an unnatarsi iact-oagnt
not 70 be. and. ere long viii not BE- The people which
has conquered the Mississippi and the H11son-whlch
has foot on the Atlantic and the other on thr
pschc-must overcome s Two seas az q has done i,s
rivers The contest Is one 10 which We may well en-
gage with al srt0r combating With science s. our
weapon. for the object is sublime To shorten dstsn-
oes, IS 70 eHiishten and elevate the world.
10 9 but ie = years since New OK undertook thr
enterprise Of Ocean steam Nsvi Cation and already near
twenty ships bear w.iness 10 hor activity new huls sre
built her ship yards snd her iounderes and schine
shops rirs with the preparation OF machinery.
The construction Ot steamer - directed ~ three
men, each Of whom performs separate duty name
iy tie engineer OF the company " proprietor, .he
snip builder and the ous CINE builder The engineer de-
scns the ships form and calculates the force 90 be
given 70 the engines which the speed of the vessel
depends tho responsibility Of success or failure In
THIS respect belongs 20 him. The builders. while each
oleys the rules Of bis sri follow the general plsa
10 E1rr f.tssfv ~ ~
IL will roll easily and the engine work with SEES illness
They succeed Tell according the vessel ss- long
short time sud requires much or little repairing
I De Engineer having designed the midsnip frame,
examines what kind Of bows and stern should be
adapted 20 %. On this much depends tor according 10
the er-.h and the fixed upon the resistance OF
the water varies much In the proportion OF one 20
four Then, measuring the surface OF the perpendicu
lar elton Oi tie frame he determines the force NE
cesssry for the engine IN order that the chip should At
tain ,ha spcef required the elements OF this caeula
ton arc the surface of the section snd the supposed re
s.tsnce Of the water according 70 the form dopted
The speed the ship depends It's form and on the
force Of toe engine according 10 the following physical
laws
l. The speed Of ships having the same immersed sec
ton and equal engines but different forms, will be in
ver.oy proportional 10 the cube roo. Of the resistance
Of tie water to their forms respectively.
= The speed OF ships having the same Immersed
section and the same form but different engines will
be proportional to he cube roots OF the force Of the
en- glnes
By thi. i'm. plain that the form and the force OF the
engine have equal effect upon the speed and that
amounts 10 the same result 20 give 10 the bows curve
which doubles tho resistance OF the water b double
the force Of the eagine But IL Is plain that the second
method has serious disadvantage 10 Is not always
possible to enlarge the engine and when Il t. I,
dmnishes the stowsge increases the quantity OF coal
necessary for voyage and MAKES greater difference
in the draft between leaving aud cunning into port
which 1. 90 uniavorsble % the action 81 the paddles
To illustrate these remarks ths following table has
been prepared with oil possible care according to the
information which has been kndy furnished the writer