New-York tribune., 1903-07-17
rYE.BARs COST LESS, HE SAYS.
A. Marriott Defends Commissioner Linden
thal's Plan.

-, ~ Commissioner LindenthaPs plan for the
Manhattan Bridge He said;
an ,bs engineers on the Manhattan Bridge Com
Enission are as are Roebilng Sons Company who
y -. - q general use OF eye-bar cables an end of
Sc - ioonSnoy OF wire cables; William Hildenbrand,
me- enneTintendent Of erection, and o. F. Mich
70 = dismissed engineer OF this department As
= - ne Roeblng Company the unsoundness OF their
sConfention IS apparent when Il is realized that they
hhsssviasL The motive for the criticism by the
oi4s!s atneers of the new bridge-George S. 9iori
q Schneider, Mansfield Merriman. Henry
Il Te-elssThe use of eye-bar chains is older than
- Of wire in suspension bridges 1t is pro
e5 70 make these eye-bars Of special steel having
jnaTe az inch and TO subject them unit stresses
eSut ons-hslf those puI on the wire cables OF the
W. oTn Tsight as well as that Of other parts of
the bridge ano the moving lGad their sec[On 6f must must
cables The quality Of this steel is the only novel
T3ous are that q steel viii be obtained which viii
f1liv meet Jne requirements OF the case, we ask
7Tese1i II il should be found impracucable to get
his high GRADE of steel 1 similar chaIn9 ioa Sap a 9e
Increase in size Of chains, DUt not modifying the
general features Of the design The chains nave de-
e6ed advantages In the accessibility of all parts
for inspection ano protection, as Well as IN econ
omy and rspioity Of erection They are to be pre-
ferTe5 10 wire cables. whenever the cost Of the
chains is nor materially greater The cost OF eye
bar chains ana wire cables in this bridge would be
InetT GEa- report 10 the mayor unoeE 0aLS OF
June e. 1906 stated this:
PREPARED TO FURNISH THE STEEL
"New-York June o. 1903
Hon Seth Low. Mayor OF the City OF New-Y ork.
=. EL--7s- n SSoJ7y5eef5T 9 10 - r,ass mon me
plans prepared under tie direction OF the ConmIs-
-enorf covering The rrincDaI features Of the design
We deferred our final report. relating 10 the quail
lry Of the material 10 be used for the eye-bar
fhoald Be sasfed BY Correspondents with the lead
ing manufacturers Of structural steel that the
desired material could be obtained at reasonable
proe and in open competition
Three different manufacturing plants have man
uacured and tested nickel steel bars for the pur-
pose OF this investigation. From the results OF the
which will meet the requirements hereinafter out
~Our investigation relating TO material has been
restricted 10 the special steel best suited for use
IN eye-0ar cables as this feature OF the design
under consideration is the main departure from
The usual practice in the design OF suspension
steel Of the following qualities. in full size an
nea-ed eye-bars, viii De satisfactory:
Ultimate strength. pounds per square inch 5000
AcI-a- elastic limit pounds per square inch- $500
Percentage ot eloEgsUoE IS feet-.-.-..---.-.--
Percentage Of reduction Al fracture ~
The maximum stress in these eye-Dars. under
M 5oT5s S3 nr mel f6oI iSa 'Ie S 16r 1narv NM
reDoL Cogetne- with effect OF terpera tIre should
noL exceed $1,000 pounds per square inch.
The tests SO Tar maoe would indicate that the
above results Can be obtained by steel MADE by
ne open hearth process containing 81 &c 81 per
cent OF nickel containing not over 05 per cent Of
sulphur, not over .05 per cent phosphorus, If made
4-Il--Ce -4oI over cent II MADE IN
Three manufacturers. with established plants
state mar they are now prepared to furnish steel
70 tu-nl Inc above requirements, and others state
thar they can arrange TO furnish It in reasonable
the, = The demand warrants them in so doing.
TIE strength q steel eye-bars having the above
S7s now Used IN The besf class 81 bridge con5trc s515F
ton ne working strains can therefore be increased
In our preliminary report Of March we report
q this bridge, subject only 10 the uncertainty OF
o5talnins tlis quality Of material This uncertain
In lh.s final report we unanimously recommend
9. TIE 3isThsJtan BRIDGE as SUBMITTED to US BH
the Commissioner Of Bridges"
SAYS EY-BAR CABLES ARE CHEAPER
Eye-bar cables are superior TO wire cables be-
accessible for painting or the use Of preservatvee
- 5E----ss al ,245csshtsge II respect TO rigtdity
l-4 clIaol-ltF Wire cables must be spun, after
and have steal bands put on them ali of which
a-zfs oelay. and when il is considered that as
5-s a12l{ seyenty-siz hundred strands. the la
t+o - y 9TeaEs, VII win the dlftculty Of getting at
-e 10 me time Of construction. Il can be said
around. while wire cables requiring he5 UorE
cs1tHa On weather and season.
The dicrence in CO.. 6etWeen ei4 tRe 0e TFe tgFe
zT5 2T H. ne 4, DR. 6r.1gs one with nicke! steel eve
g. n favor Of eye-bar cables. but rapid manu-
---I5 ana erection and thereafter greater facility
l-----e7Ilce' are advantages not 10 be under
CHARGED MORE THEN THAN NOW.
~. -.-5a5 l5s Peellar t2a1 The ROebling Company fur
F pound. when twenty Years affer dasri,e5
o.---e- AelHo1s IN The steel business thew are
e.--= a. cents pound.
sa s egsssa5 5s ASKED I'd "5f - rla5 if can make
Pennsylvania Steel Company Carbon IRON Sc753,
RsnE Cambria Iron and Steel COMPANY and he
,i---5Ae-l steel Works all can make the par
5gS2s. 5s. eye-7ars designed for the Mammalian
flEaLy. 10 rocking towers.
rros- .5ss- ne Tower adopted is. perhaps the
CO.. 2' ~ !ealure u the design but the novelty
.s u Is application 70 structure OF this
ssLs o four vertical posts which are buiIt steel
.L-l,-Is t@rn supported " a rin at the borrou
r+r -St-S 9eing Tsldly fastened to the top with
s~s '-l poStS are connected by cross struts
tts ns mo rigid frame more than Three
bDr is So '--A IS hel1 vertically by the chains,
aocorlro7s+ - TOE on me pm hearings below to
persrlr-e Tt9e rs c-lelliis under strains and tenn
me design is correct in principle and
o1o-e-Ieo from any form Of rigid tower Wher-
TIE Tn 80 = II 70 Iasten the cables rigidly TO
rrs;+fo~ ~ re towers, providing for changes OF
-~efsI oec - s4o1les. the increased strain in the
49, Ialsed by such reflections of The towers
~ r--e-s Kept within safe limits The device
s even these strains
SCHElIING CONTRACTORS
trsc, rs always been the plan of schening con-
n 49, "44eneFer a public work Is undertaken
sbs - - teennical questions before a lay board in
nope Pc of deriving some profit
press- arrest bridge in course OF construction at
tS.soec and II has an / 500 foot span Fve-bsrs
uss6 y i4ehes vide and two inches thick are being
- LIS ano no one has raised q question
r,o,,E commission OF expert engineers after sly
ksyo- y testing and calculating. has reported to
has- 1oN mat in its opinion the eye-bar IS +he
this od -..ed for the Manhattan Bridge. Opposed to
stssl s1lon t5L are few scheming politicians and
poiles- winch Is the more reliable?