The New York herald., 1864-08-22

The balance sx and twelve Founders.
The atteen.inct army guns enumerated In the avove
table seventeen feet nine long. The navy
guns seventeen tee Ave inches long, both descr
tcns, four feet 10 diameter as the trunions.
Descriptions Of the twenty nch coumbads have been
already widely circulated through the ress tina, their
enormous dimensions are famiar to the public.
The finishing OF such immense guns nfteen aud
twentyfnc colunbiads huge task and one or great
aicety rney required to DO Finished inside ana out
10 scale furnisncd by The goverDment whose
dimensions the inspectors uexorably mold proprietor
81 hc 0orke. TIE anshng OF gun therefore,
sarly conducted with tho Same care and completed with
as much mechanical skill as piece OF the finest ms.
chiuery. ihat readers may have some idea OF Tie
required and the nce TO be observed Ia
tht use OF The ioa We state that government inspectors
the s4e OF the bore sa nundredth OF inch larger
ne @ ,os 20 ,so me gum aaa nothing
Further obtained 10y stating that hundredth Is
ne not quite as thick as The nterstcc between tbs
the irest those fine ned combs used for
10 ants heads The fact nat but gun has leeu
jecd cut q ho large number cast for such depar
he scale s wonderful certificate to the sxl OF
the sorkmer employ ana the hnh the machinery
nScd he runs are also rejected for other equally
A. nuie Tor instance, we tced two guns that ,he
inspector had refused pass U which tho aaw that
condemned them OF the circumference an ordinary
ead reacll, not over the sixteenth OF inch in
depth, ADD stusted In the extreme end of the
sar.sce o. the trnniop, point where even II IL ned
oceG hs big a. egg u cosid not have 10 soy way
Affected the wear o. the gun We have cited THIS
STANDARD. 10 which The guns must be nlshed 10
be cp,cd ny the government 20 show that although AZ
arst but hgse mass OF iron casting. OF from y
and sSly IONS ~ weight, the monts must be prepared
and the casting done fac bronze and
q
gun acceptable TO The government .-
ihe casting ol thcse heavy guns made on wha,
called zoe hollow or "Rodmao principle patent,
which, not being generally understood by The pub c mar
render few werds ot description interesting.
on ,he R.iman prnclc the TASK is sunk IN the pit as
~ sd cstngs tube closed aud water tight al lower
emu aud pued the exterior tor escape OF the ss
generated hy The metal, iorms tbs base The coro rh,
!uSe = ~rarrec closely aons is entire length with
three fouths of an inch Inside or this tnba is copper
pipe icr The purpose OF Conducting bottom
~ XaruA he
The entire tnbe core ,rd the snrpus passes or from
pipe a, he tor After the metal has been poured INTO
sse,,rs ese mould ,be ssn, water allowed TO run
stopped on for an bar hour or so daring
which time ine hos' Of the yet uucooiei
huge mass of molten metal causes the cord already
meninDea as wrapped round the tube 10 be consumed
whep the entire core witch would otherwise from me
shripsns O tne meta around u. be impossible 70 re-
move, u easily ~thorswu Water " then allowed 10
ron no The !hvs cleared bore ot tie gun until rs
Gently eooied to te hoisted from the lak.
~ This process A close grained interior IA obtained
svns greater service tn the gun beng thus cooled
fsm ne interior saafds the additional advantage or the
Mttsi shtnshg upon The centre, thereby causing Q
paiurs tsndpg o' The metal around the circle Of the
bore another advantage gained BY this method OF hc
~" castings The avoidance of danger OF crack
,ns mass Of metal hugo the
e. a!s,n 1 ,,en ,.n' I % cast sold wl crack in seven
eeyeicd nd psreced 10 the Fort PVT works by
lev q ne ofemen q the establishment ard Iieltensrt
snd ~ witch he obained patent The or this
method = cissDg guns furtbur shown by the result
~ eApfbscna made 1t these works IN casting "
the sane ai2c IN pairs, The boilnw praepie
ore WITH tne sOiid core Tho result IL paiT thus
nsdo vas thaL while the gun cast on the solid method
burst on The To hundred aud nncty ninth discharge,
We zee 20 ths hollow psn was Gred ose thousand I've
hundred times without any p.fcepble strain. IN anq-
ther rtr purposely made with very inferior metal The
one cast On the solid plan burs ~ The nnoteouth round
wbfs the other discharged i~o bundred and ATTY
times fn another csss hoOw cast ynb dfed ibIse
thousand eight bnndfed times without any iniuriCgs
rtyglh being srparcna
The estsbs shmeDt which these immense, and, IN al
rsTects e0uSerrui g0ns made, oCcunes s4uars u
srruud oer and enty eight fset BY han.
drei ty. Of thH a.acs, the foun Try propsr two
srndrcd ard slx,y scet long oy ninety vide. The
boring n thfee hundred and thrty eight feet long by
1y two VIDE. rhs rcst c the ground y surrounded by
naCbrc shop pattNu shop offices, nc forming hollow
square there m use 10 the found for melting
poses s'y furnaces aud so crpoas. one Of these tur.
naces oct probably the largest in the world melts
charge Of forty tons 0 metal Al ons heat two Others
twenty Owe tons each three others htesn each ard
the two cnpols twenty hvo tons daily each AZ hsh ~
three hundred ADD nine toes 0 metal besu run Into
guos week, without ibt use 81 tne cuyOlss and with
but portion of the furnaces.
The power Of steam 70 largely used 10 exredlny AMI Il
easing the labor ~ the works IN the foundry tners ara
slx steam Tor handilns tho suus when
cAst, two hs boring mill tor similar pufposes beside
four large cranes worked by hand The loading OF the
guns upon the which run upon railroad built In
connection With the works and tho railroads centcrna at
Psourg also done by huge atoaIn derrick. Railroad
ruCwn And kablon throa hou