The Cairo bulletin. [volume] (Cairo, Ill.) 1872-1878, 1878-01-13
NOTICE. TO CONTRACTORS.
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Cairo, lils., JaL. 8, 1875.

Sealed proposals. "a i'll be received at this
office, directed ~ the city cOuuCiiOi Cslru,
limos, until D o'c.ocs tuesday ~, ming,
February 10th, a. ID. 1873, tor The coustTuc-
tion OF q one span IRON bridge, together
with The approaches or abutL1ent, an ;
foundation, across Cache river, about one
and one. all miles from Mound City ri =
road uepo aud four miles nUrih OF the city
of Cairo, ~ the counties of Alexander and
Pulaski, state OF Limos, according 10 me
plaDs mi spec!d: atlOns prepared 10y j In
7. Hsiy, ESQ.,, U. T., now ON Tile and sub
ject 10 examination IN tits office, tie speci-
tic,lious Of WHICH are a, I'll ows, viz:
Said bridge ind trestIe work q he made
up Of eighteen u.s. op nings Of eight ell lS)
feet iiom centre TO centre OF 20 II, and one
span OF one hun ired ,lg0J feet a,ross the
river bed.
The one hundred COO feet spsn Il, be of
iron, aud ~ pI0poruOLed that LOAF OF ten
90 tons dist ibuted over twepiy toy Inca
teet al The centre o. the |, an, shail lot
strain the lion over twelve thousand
az OO0) rounGs per square inch tensile, r
over seven thousand I'VE hundred 4 10Y
pounds per square inch theariDg strain
the strain In comp es. ion to be III at,
lea't 10 the proportion to the ratio o.
length TO diameter, by UordOh's formula.
The span oil said bridge to be one hun
ed (lOO) iett in the clear and the roadway
twelve Q2) feet wide.
The door TO be OF white oak plank two
and Obe-hali Cd inches thick and not oy er
twelve (I2) inches wide.
The floor beams TO be Of tie oak and Ia
proportion 10 the balance Of the Que hun.
DIE Il Vi feet span structure, and also TO
l.. 10.
The ab We 10 rest upon iron columns pro-
pDrtioned 10 tine structure to be supported,
the columns 1T each end o. tue bent or iron
span to be placed on a mud sill '2Xl2, TWEEN.
~ (l0) feet long mOrticed aud teDOned 10 a
sufficient number Of waite oak pies, firm.
Is driven into the river bank.
1REsTLg WORK.
The bents to b. formed oi tour posts 10Xl
inches square, the Two inner parts TO stand
perpe molecular and the two outer parts tn
be framed and stand al batter OF one in
eight. The cap aud sill oil the bsnts TO be
l2Xi2 inc square timber, I o caps to be
twenty (2D feet long, and the sllls 10 pro-
Jet on each end two jett past the outer
enge OF the on side posts. The posts to be
mo ticed aud tenoned into the caps and sils
and each tenon 10 be pinned with two
tbree-quarter az inch square iron pirs, and
each bent T. be braced ny two diagonal
braces OF l2X2i inch plank, well titte d and
spiked on caps, posts and sllls.
The bents TO rest or stand u on four mud
sills l2Al2 inches and eight (S) feet loug se,
in the ground and placed on the slignmen,
Of the work.
The carriage way OF the ;trestlework Ia
be sixteen (lH) teet wide, the floor plank
be tniee t3J Inches and not over twelve
| on inches wide, and to be well spiked on
TO the s'rirgers and floor beams.
The floor beams TO he IN de up as follows
two (2) stringers OF SXl2 inches s,t on the
caps and sixteen (l6) ieet apart from out
SIDE to outside. The space between said
stringers to be equ,lly diyined for sever
~ beams OF 3Xl2 inches each and each sci
OF floor beams or spans to have three (;l \. I,
OF her ingbon, bridging OF 2Xi inch scant
linz.
The stringers and moor beams to rest a
least Blk (6) inches on The caps.
The stringers 10 connect by half JOINT
| and 10 be fastened TO the caps by one incl
round spikes or bolts eighteen (ls) inehe
long.
A railing or ballasiers four a. feet higl
n be constructed on each side OF above dis
eribed trestlework. lhe yosts to be Ak,
| iuSu Tue IhNltIl
ed on TO the 4 myers by two (2) one hal
inch bDns. The paris to be six co. lee
apari; the hand rail 2Xi inches. aud ~
axle guard OF 2X 2 inchss, all well taste ne,
on 10 the posts.
All OF the above tlmbers TO be OF whit
or burr oak Of best qua lily, an,
the work done In a thorough and work
manlike IN inner, and under the supervision
OF such person AZ the committee on street.
or the city council OF the city OF Cairo ma
designate.
The approaches to above trca,le work M,
bridge TO be Of earth and with slope Q
not more than one in ten and not lie, thai
sixteen (i8) ieet wide on top. With q tlop
TO the base Of one in two. Separate bid
VIII DO received for iron span, includin