New-York tribune. [volume] (New York [N.Y.]) 1866-1924, 1875-06-07
AMERICAN IRON STEAMSHIPS.

LAUNCH OF THE CITY OF NETWORK AT CHESTER.
The twentieth steamship launched from the
yard OF John Roach Son since October 1871 went into
the water Chester PENN Saturday Her name Is the
City OF She will be OF capacity OF 3ooo tohs'
Custom-house measurement with accommodations Tor
1853 first cabin and 900 storage passengers III just
thirty days the City OF San Francisco was launched
the ways then alongside Of those which the City OF
York has left The latter named vessel In all
respects exactly the duplicate Of the one by the side OF
which she was constructed. Her keel ives laid Nov 10,
1874 and another-the thirdhp Of precisely the same
type and size will follow her into the water within about
month Each Of these three ships 1853 feet long, by
4Ola feet wde with depth of 1914 feet from the hurri-
cane deck and 81 feet from the spar deck They will all
be bardue rigged and each will spread 1900 square
feet OF canvass.
The CITY OF New-YOrk" christened by Miss Sarah
E. Roach daughter Of Mr.. sohn B. Roach, and grand
daughter OF John Roach About 81 seconds from
the time the "City Of NewYOrk began to move until
her bow dropped from the ways She sailed out nearly
mile into the Delaware River There were many Doats
on the water and the appearance of the steamer was
greeted with cheers, cannon firing, music ana steam
whistles The Philadelphia Navy was represented by Its
commandment, Commodore Prebe, and large party
Mr. Roach has built the last three iron seasps Ior
the same price the lowest foreign bid for building
them These ships Will be provided with zen metalne
ebOats, with aggregate carrying capacity for $50
persons and with feafs which will carry 800 persons
The dnngsaloon is SO feet long by 40 feet wide. The
machinery proper consists of pair OF compound engines
fitted with surfacecOndenser and six boilers and with
separate engines for working the air and circulating
pumps aud also the feed and bilge pumps BY this ar
rangemcnt the main have work except to turn
the propeller The high pressure cylinder 81 inches IN
diameter and the low 49, each having stroke OF
piston of five feet This plan has the great practical
value OF rendering impossible any breakage OF the pump
gear from the tracing" Of the propeller engines IN
heavy weather thus insuring always the regular ana
easy operation OF the pumps The six boilers arc cy-
drca in form and measure 1874 feet in diameter by 102
long, tested for working pressure OF 80 pounds per
square inch There three furnaces for each boiler ana
the aggregate amount of crate surface in all the boilers Is
$50 square feet and the entire heating surface is 1000
square feet The propeller has diameter Of % feet
The shaft 100 long by 10 inches in diameter The
maximum performance of the engines will be 90 TO 20
revolutions per minute with speed OF vessel in good
weather from 10 to 6 knots per hour In case OF acci.
dent serious enough require IT, the air and circulating
pumps can used blge pumps TO clear the ship OF
water These are in addition to the two No. donkey
pumps specially provided in Of leakage or fire. On
the main engine there two large bilge pumps, ar
ranged to be connected disconnected AT Will On the
pumping engines four bge pumps. and In addition
TO these the ar-crcuatng pumps can at moments no
tce be converted into blge pumps also. Other bilgc
pumps of large capacity driven by the hosting en-
when 1t may be necessary The aggregate power
Ions 57 per minute There are seven bulkheads
tight compartments. 1t will thus be understood that
every possible precantion against sinking as cOnse
quence OF collision or otherwise, has been taken.