The Cairo bulletin. [volume] (Cairo, Ill.) 1872-1878, 1878-01-30
NOTICE TO CONTRACTORS.
OFFICE or CITY CLERH,
Cairo, His. Jan, .. lS1a.

Nhiios i1ls't voh' - Ao'C. ,
SeRied proposals will be received at this
CiilGe, directed 10 the city council OF Cairo,
Illinois, until O'Clock Tue sday evening,
February oh, A. ID. 1873, tor the cons;ruc.
ton OF cnu span iron bridge, together
with he approaches or abntmen,s and
foundation, across Cache river, about one
and one. ,aii miles from Mound City rail-.
RI adj uepo., sGd four miles north OF the city
OF Cairo, 10 tho counties Of Alexander and
Puisski state OF Illinois, according IL the
plans and rpeciii cations prepared ny j 'hu
L. HeIy, ESD, Z. e., now On nile and sub
ject 10 examination IN this . tflce, tho speci.
iicalious of which are n follows. viz:
said bridge and tre5tle work o be made
up OF eighiceA \ASj 0p, Mugs 0l eight en- [iSj
feet lIom cen're 10 centre OF 20 II, and one
span at one hun irsd 400 feet aIross the
river bed.
The one hundred 900 feet span to be Of
iron, end - proportional that a load OF ten
| lOJ lon- dist ib,I,ed over twcpty COY hnesi
| tpet ut the centre o. the span, shsil not
| strain the IRON over twelve thousand
! II DUU, pounds per square inch tensile, or
! over seysn thousand five hundred 4 40
+, pounds per squaro inch shearinf strain
| The strain in conprts Ion TO be IN as,
| ,ca 1 in the proportion 30 tho ratio OF
! ,engih to ismetsr, by Gord0n's formula.
! Tue span OF said bridge to be one hun
! dred ,lOU) feet i'll the clear and the roadway
twelve ~ feet vide.
! The fioor 10 be OF white OAK plank two
and one-haii i?lj inches thick and not over
| twelve W. inches vide.
| Tht fDor beams 70 be g! white Oak and In
proportion TO the balance Of the one bun
die. ll,0} ieci sran structure, and also 10
be provided with suitable axle guard.
Tho nhsEe 10 rest upon iron columns pro-.
p1llsoneu TO the structure TO be supported.
The columns at each end OF thu bent Of iron
.pnn 10 he placed on mud .iti IN IL, TWEEN.
~ % icst long mOrtlced aud ,ebousd n q
sufcieDt number Of Waite oaS piles, liru,.
IS driven into the river bank.
IRRSILE WORK.
lho hents Ia ~ ioyGned OF four posts l0& 10
!Nchas .Cuafa, the two inner parts TO stand
perpendicular and the two outer parts TO
30 framed ami stand at q batter OF one il
cighI. The cap spd ill OF the bent: TO be
l9&l2 inca square timber, t1e caps 10 be
twenty e., feet long, and the sius to pro-
ice, on each end two feet past tho outer
edge Of tho oU,iac posts. The p0sts TO he
Wpl' tapl arAtnoncd into ihsGana4nf pN5
thrcesquar,cr I inch square Iron PITS, and
each bent - 10 btacst by two diagonal
braces oil l2A2t inch plank, well litt.d AID
| spiked on Caps, posts and sjil-.
The hRGt- 10 rest or stand !! pon four mud
.ils 12&l2 inche. and eight Is, feet long set
in the ground and placed on the alignmsn.
! Of the work.
The carriage way Of the strestie work to
Dc sixteen tlbj feet wide, the Hoor plank
q be three Idl inches and not over twelve
,l?) inches wide, aud 10 be vel! spiked on
50 the s,riBgers and iioor beslas.
TAo Moor beams 20 be made up ss follows
! -, ytriyuoI.s ff Y ~ trnhaa me- l,n
caps and sixteen liG) icct apart from ont.
slde 10 outside. The spsoe between said
strlnrers 70 he equally divlocd for seven
q beams of3Xi2 inches esch and each set
Of t,oor beams or spans to have three 81 sets
OF hcrlingbons bridging Ut 2X4 inch rcant.
iiny.
The strineers and moor bpams 70 rest at
least Tx tG} ioclles on he caps.
This stIingora 10 c0nneC. By half j0,pts
and TO be fastened TO the caps by one inch
round spikes or bOlts eighteen u.s. inches
long.
A railing OF ba|lssters four a. feet high
T. be constrlctet on each side o! above dis.
cribed trt-tlcWork. The posts 10 be 4XG
inch Clees and braccdOn the caps and fss en-.
ed 90 70 the sii i0gers by two t2j oho.hsli
inch boits. The parts To no six % teet
appr: the hand rail 2Xi inches, and an
axle guard Of 2X'2 incbss, all well fsssens
on 70 the posts.
All Of the above t!6lbeTs 10 be OF white
or burr oak Of besi Qua lily, and
the work done In thorough AMI work
mGnI!ke IN inner, and under the supervision
OF such person as the committee on streets,
or Tho city council oi the city al Cairo may
desiguate.
The approache. 10 above trestlewerk and
| bridge to be Of earth and with q slope Of
4 ...t =. -
20 the base OF one in two. Separate bids
win bs received for iron span, including
ahuiDents and foundation, for The wooden
ttc.;lO portion of said bridge, and for the
ear,ben approaches, or tor the entire
work.
| !ho, hight to reject any or all bids, Is re.
served, j, y. PHlILIs,
dti. City ClsIb.