The Cairo bulletin. [volume] (Cairo, Ill.) 1872-1878, 1878-01-10
NOTICE To cav ira CTORs.
OFFICE OF CfTY CLERK,
Cairo. llls.. Ian. 3. 1873.

cairo, U.s., Jan. D, 1910, J
Sealed proposals will be received at this
office, directed 10 the city council of Cairo,
Illinois, until O'Clock Tuesday evening,
February 10th, A. ID. 1878, tor the construc-
ton OF one span iron bridge, together
with the approaches or abutments and
foundation, across Cache river, about one
and one. ialt miles from Mound City rail.
road depot, and four miles north Of the city
OF Cairo, 10 the counties Of Alexander and
Pulaski, state OF Illinois, according 10 the
plans and specifications prepared by John
?. Hely, Esq, Z. f., now on file and sub
ject TO examination IN this Office, the speci.
titiiiOBs of which are as follows, viz
said bridge and trestle work 10 be made
up OF eighte Isl openings OF eighteen QSl
feet rom centre TO centre oil posts, and one
span oil one hun ired 100 feet across the
river bed.
The one hundred 400, feet span to be OF
iron, and so prOportioDed that a load OF ten
llU) tons distributed over twenty (20) lineal
feet ut the centre OF the span, shall not
strain the iron over twelve thousand
IL O00l pounds per square inch tensile, or
over seven thousand i've hundred Il 500
pounds per square inch shearing strain
the strain In compres ion to be IN at,
least In the proportion 10 the ratio OF
Ths snsn ot sai d bridgs ~ he ona HIN.
dot uhr fae, in the cisar snd ths roodwav
twaIys ~, ,eet Wills
Tba foor to he M wb;ta o.l n,.nt two
and one.half I9Sl inches Ihick ana nor over
twelve I'D inches wide.
nronor,ion m the hs,srca ~ ,ba one hnn.
dIe IL ~ foe, man strnctnra and slsn N
ha nrovided With n sn,tsb'a sY,e guard
The ahoye N 70 ~ unon iron cnt,,mns nro.
nartioned N the str,,ctnre n he snnnorfed
tba coInnrs AZ a ,ch and n, M bonf nv iroy,
snan IN hs nlaces IN a mud s;li,yYi1 TWEEN.
~ ON teet lone morticed and tenones m a
IN III cient nrmher ~ WHIT oat n;IsS firm.
Nv driyen into the river bsnI
YpEsrIu vcpV
inches .nnare tba Two innar nsrts N stand
ne rnendicnisr and ,be ,wo am,s, n.Its tn
| re framed and stand AT a hst,sr NJ one In
| ei1hr The can and siij n, The hsnts IN he
| mo inc, sn,iare timber t,s cans IN he
twenlv p y feet long. and the siIIs TO pro-
| ieci m zach and two tea, nast the oiIter
s,,re NJ the omtside no.ts The nosts TO be
| mor,icad and tenoned into the cans and stills.
| and each tenon 10 he mined with two
| tbree.Quarter I3l inch square iron pirs. and
| each bent 10 be braced by two diagonal
| braces of l2X2I inch plank. well fttad and
| spiked on caps, posts and sills.
The bents TO rest or stand Don four mud
| sills l2Xl2 inches and eight (si feet long set
| in the ground and placed on The Alignment
| of the work.
The carriage way OF the trestIework TO
| be sixteen lGl feet wide, the floor plank
| 10 be three t3I inches and NOT over twelve
| 'l2) inches wide, and to be well spiked on
| 10 The stripgers and floor beams
The 1oor beans to be made NO a. follows
| two on stringers of sXl2 inches set on the
| caps and gjxieen 1Gl feet apsr, from out.
SIDE TO outside. The space between said
.tringers 10 be equally divided for seven
| "A beams of3XIa inches each and each sci
| Of door beams orsDans TO have tbree ri sets
OF herfingbone bridging OF AKA inch sesnt-
| ling.
The strinyer. and f,oor beam, m rest AZ
east ak iGl inches on The caps.
| THE stringers 10 connect Inv half io,nts
| md m no yasfaned ,o ,ha oans he ono inch