New-York daily tribune. [volume] (New-York [N.Y.]) 1842-1866, 1860-02-29

If N.w.Yorh. BY whom il was arst suc,sssfdykput in
ons,a,;on in Rochester and Willamsbnrgh, SeH-York
thonph this has been attributed TO an English work
man. who afterward obtained patent for the process
The making OF maeable castings is another process
IRE object of which s to act upon the carbon, and by
s removal IN tots convert articles first cast in the
forms requr, for use into the stronger material, NAL
eabe iroD The cheaper of casing and decar
bsnziDg are substituted for pudding ard then forging
the bar iron into the various sbapes. IL is applied
chiefly 10 mail articles and thoee which by their COM
plcaied igures are cut aud expensive 20 fashion by
tho hammer or by machinery, such ss the iron paris OF
machines, of harness and multitude Of utenrils 10
common use The practice has been 10 first mold the
place. in cast iron and then pack en- in bed OF oxide
OF iron or iron rnst contained in furnace. Here they
a,e e,pos.d TO mcdepate beat for long time. The
oxide of iron gives up liz oxygen TO the carbon in the
cast irop and The product gradually passes oil in gas
Small articles are thus decsrboDized III nine or ten
dave; and heavy ones ara packed again ana exposed
ecord time TO TIE process. The operation Is defective
wing 10 the accumulation Of a spongy iron residuum,
reduced from the oxide which envelopes the castings
md prevents the approach of fresh portions Of tie
xide. As ibis incr1stson increases the process goes
N more and more slowly, TIL it fl ay stops; hence the
Ingenious and beautiful method has been recently in
vented by the same chemist named above by which
his dlfcuJ is entirely removed. IL consists in the
,ubsutcn Of On oxide Of a volatile metal, as Oh Ahc,
the ulace of oxide of ,on. IA this s reduced to the
metallic ftste u zinc passes oil III V'por' anu "osH
porops of the oxide ave brought in contact with the
carrps Thus the decarbopizstion will 90 on as long
as there IL oxide preient and carbon in the ron The
a 4 >ila in he mel
and ia cea.ing 10 come verinoces tbeexact moment
when there il carbon left in The IRON 10 re"uco
the oxide. Small articles are thus decarbonized in -
honrs and large ones in IS boars and The process may
b. extended 10 cas,ings OF any thickness An impure
white OXIDE of zinc may be used for this purpose or
nave oxide Of zinc The meta, coniense ss IL ds'Iis
over and il collected ana cast into in9ots IL ID 1onnl
10 be very ue So that is better ADAPTED for chemical
nses tie manufacture of batteries &c, than the ord
nary zinc Of commerce. III this operation, TO decar-
hopize 40 bs of casngs containing two per cent ol
carbon, ore hundred weight of oxide would be used,
from which 80 lbs of metallic zioc wond be obtained,
worth much more than the oxide An excess of oxice
is used in order TO form bed for the castings The
excess goes into the succeeding oper2 n. The COM
mon yellow oxide Of zinc suitable for this use, can be
had Tor two or three cents pound. The commercial
metal ls worm SIX GEMS pei PouLu, Oue sne Puiy Va
the article produced by til process must give 1t much
higher value; indeed zine of this character IS sought
for at prices many mes that of The common znc' But
even at be current raes the preht on the zinc s alone
sufficient 70 pay the whole expense Of the decaIbona-
ton
THESE favorable natures must give to the new pro-
cefs Sd immense advantage over The old, and without
doubt lead complete revolution in the maonfacure.
company is organized under charter obtained from
the Legislature of NewJersey, and works are already
in operation Elizabethport in which the first trials
have been successfully conducted.