Wheeling times and advertiser. [volume] (Wheeling, Va. [W. Va.]) 1839-1849, 1843-11-22

ment q" inns afi, mad been pfeeladed irOin The bese
Gi of n bri lge.
The bridges whIrh is the object Of these re-
MARKS % recommend. are sustained by wire CABLES.
stretched between appropriate supports &c IN ssnry
The cables formed Of an ss-emblaee of siralis
wire. ahoui the diameter OF comm writing quill
mo. 10 IN commerce which laid parallel eae
9th the prOcsss Of their manufacture and alter
ward collecie {" solid mas. nd hound together
by hgaiur~s of the same material. The number of
strands IN each cable depends on the magnitude of
the br dge which thet attended support. and
the circumstances VI its situation In Drudge II 400
iect opening between the points Of and IS
feet vide n The clear. there would lie needed CD
bles each sni leach which would be comp sed
IN general "i mol les. Than 400 strands Of ire o,
there would be required Tor such ia dge 10 cables
n-a-ly inches IN diameter. each Of which would
resemble. when IN place. s.iJ bar Of iron about
100 Irrt long; The whuIs number possessing an ab-
lutte ienssIly Of 5000 luns
A cuai oi vanish Is applied n every wire prev-
ously q" the "rmsli"n al The cable, which, hgether
with other pc, cautions, of adequate protection
against OxsdaIlon.
There are many reasons adJuced for the prefer
ence gwen wire eablesover the hains of bar iro
which they have nearly superseded Il is NOT pussr
BILE To obtain iron free lnm flaws. though oil reason
able precauiion may be observed in IT'S acnre;
aud u Is not always practicable detect the flaws
by the test TO whch each bar is subjected prhr Co
It's emp!ny ment ia the structure. There /. no psac
icable means. either OF preventing injury the ma
tefal IRON the sudden ahd extreme variations Of
temperature incident 10 a high nonbern latitude.
These difficulties. though net sufficient l.. offer
indispensable objection Ia The employ m+nI OF he metal
'i THIS slate. are. ncverheless. Of sufficient weigh
to bs avoided when p,sshIr. aud they ure remoy cd
by The substitution OF wire cables.
But the superiority Of this material consists
ia The remarkable increase OF tenacIly which is
parted - InOn 10y the process Of dra wing The
structure OF iron. h,r- sim. ~ hat ehTysialliDC
By converting it Into wirc the granular particles OF
which At ID composed. elongated. and the s,ruc
tnre bec"mss fbr'us. The Const aaenccs ui this
change appears 10 be ex'rso. binary Increase OF
sir' Myth aud Ioughness The experiments OF NJ. Sc
gum authorize Us IA vauug hs increase OF strength.
Tor The wire employed ia the ION oi brg
es. Al nearly loo per cent aud Ih1se which have
made on American wire fully sustain the esii'
mate.
BRIDGE Across rue scHUYLKrLL AT PARAMOUNT.
During the summer OF $50. lhe remark ,ble wood
en- bridge across the Schuylkul 81 Far mpuat. which
had been erected nj cos Of nearly l200U0 dollars.
was suddenly consumed by FIRE. The Company
which owned the site declined rebuilding IL. aud
snhecIing themselves 10 fhs r,sk Of repetition Of
the same misfortune; but passage al that poinI
Vas indispensable the venenee of q large pop
ulaIiOn. the County Of Philadelphia purchased the
lille Ia the se and the writer furnished design for
ae construction Of another bridge lila plan
iircly novel this country and structure which
he proposed appearing ia drawing more ike culr
web or gUssanier than The RUG stuff adapted 10 the
wrnr and tear Of heavy leans and droves beef cat
ile % mel wiIh no lule opposition both rum we'll
meaning aud from Interested parties Rut, as usual
opposition Produced discussion and inquiry. and in
q"ry biough out the truth The plIn wa eventu.
ally adOpied and the authors offer Co construct The
work al his estimate was accepted. The entire pc
euninry responsibility was. however, thrown upon
him, AID The eventual payment was coupled with
the condHpn tina, The bridge should he submitted TO
en- unusual trial Of is strength, In The curse of
very lew months irom the dale OF the cnnIrsci. he
had the Satisfaction uf seeing ofihe parties who
had vocIerlled must loudly against The adoption of
his plan. forcing their way through the thousands OF
spectator ia order To he permitted to stand on the
hoosing when ii was occupied lr"m end L. end with
loaded teams Us cOmplciIy they essld be crowded
upon IL
Tie work YVES commenced early in July 1S4l
and the bridge WINS crossed over by teams The first
day OH innafY. 1922 making just monIhs (lncin
ding delay Oi i~O inonihs. caused by the loss OF
some vessels reighled with granite for the colunns
Tor the time required lr its erection.
The length OF the HoOrisg Of this BRIDE Is $40
iee' and the distance belw The punt4 OF suspen-
sioI 5o7 feet. lis with betwe The parapeIs, is
70 feet The carriage way is 10 ieet wide. a nd
OF The iOOi ways, which raised inches above
The road way. is feet wide The bridge is sup
ported by four columns. 80 feet high, and 81 feet
square at the base, which constructed OF gran
Iie block obtained lrpm The quarries al H,llowel
IN Maine The io0ring Is upheld by ten cables ol
iron ~iFe. resting east iron rollers p. ced un
the summit Of these columns. Nhich move suireni-
" 10 Compensate for any ehaugs in The length OF
the Stays, consequent changes Of temperature OF
other causes, and relieve ;he columns OF all Iuju.
rious strain
The cables. firmly secured at their eriremities.
hang 10 fesioOns. sweeping from the SUBMITS OF The
granite columns SIDE 10 the corresponding
columns on The opposite pide Of The river. and
descend. al the GENRE. nearly 10 the level Of The
road way
IN lieu Of brace 90 guarI against horizontal
viefaiO ., The cables inclined toward the ais
OF the bfidg,; arrangement which made il
necessary 10 give them different amounts Of cufva.
iure. and place them all ~ different planes. The
ease and graeefulness Of the inverted arches are
rather increased by this lgems a. slihough the
calculations rendered by IL are sJmwhat mere
Troublesome.
Tue nprng Is suspended from the cables by means
Of wire cords. similar ~ their construction 10 tho
suspension cahles. though Of much smaller diane.
iefs- These cords ore disturbed alpng tho curves
81 distances ffaeiian less Than four feel from eacn
oiheF, with the centres Of The ls's 1T the aOorng
The inclinition Of the stays whsch pass from tho
tops Of The columns 10 the leslie iugs. spproaches
some what more nearly The vertical lhan that Of
the tangent 10 the curve Of the cables % the same
PHnis II is advisable. Oicourse. when The weight
Of the bridge is sustained hy such tall and slender
supports. 10 keep the resultant Of The pressure a.
nearly as possible ia the a1s nf the snppor. Ba,.
on The eastern shore Of the Schaylkill, there were
local circumstances which c0mpslled a certain
dev alton ffon iais cautious and prudent prioeinle
and caused such reduction of the length Of The