The Cairo bulletin. [volume] (Cairo, Ill.) 1872-1878, 1878-02-02
NOTICE TO CONTRACTORS.
OFFICE OF CITY CLERK,
Cairo. Ills. Ian. &. 1878.

Cairo, llls., Jan. 8, 1878. !
Sealed proposals will be received at this
Office, directed TO the city council Of Cairo,
Illinois, until D O'Clock Tuesday evening,
February 9th, A. ID. 1878, for the construc.
ton OF q one span iron bridge, together
with The approaches or abutments and
foundation, across Cache river, about one
and one. lalt miles from Mound City rail-
road depot, and four miles north Of the city
OF Cairo, in the counties of Alexander and
Pulaski, state OF Illinois, according 10 the
plans ind specifications prepared by J'hn
Z. Hely, Esq, g. E., now on file aud sub
jectto examination In this office, the speci-
ticstions OF which are n follows, viz:
Said bridge and trestle work o tie made
up Of eighteen (is) OPP nings OF eight en- { s.
fe.t from centre to centre OF pc II, and one
span OF one hun lred tlU0) feet arrOss the
river bed.
The one hundred COO, teet span t, be OF
ron, aud 81 propUrtioued that q loaf OF ten
(lU) ions list ibuted over lwepiy (.0) lineaI
teet vt the centre Of the span, shall not
strain the lion uvnr twelve thousand
~ WO) pOurns per square Inca /, nsile, or
over seven th!usahd tive humid ed Il 8 s0)
. UNI per square incn shearing strain
the STRAIN in comptes ion T. be III at,
lea Ill the hyperion u ID ratio OF
length 10 diameter, ny uordon's formula.
Tue span OF ,aiG bridge To be uUe nun-
I'd (l00) t-,t III the clear An 4 the road way
twelve l2) feet wide.
TN floor 10 be OF white oak plal two
aud e-bsI ~ inches thick ana not ca
w. el,e y inches . ids
Tn Il ,or beans to be OF bite Yak and 10
prol % iuu u the baunc1 If the ooe uun.
dre- a 0) irets ~ structure, and al-o TO
| b. pr''vihel With u nuitabis axle gu, a..
he 40 va 10 rest up0u 1roU co,unus pro-
| y STONE 0 The stfuG.uie 10 lot sJpp rL.d,
the coIumb at each end tue bent or ir u
span 10 be placer ODa mud bill a.Xl2, tween.
y COY leet long moiticed AID tenonec 1 O
| ,uiiicie thnmDer Il white OAK pies, firm.
ly uriveD into tn river ank.
1REsTLK WORK.
| The bents TO b ormed vi tour posts lUYl
| inches ,quare, the tw0 Inner parts TO stand
| perpe ndicular and tn Two outer part IN
| 90 'ramed ana staud ~ u batter OF one in
eight The cap AID sill OF the bents 10 be
i2Al2 inc1 square timer, to caps to be
twenty {? feet long. and the sills 10 pro-
ject on each end two ie0t past the outer
eJge of the gu sida posts. The posts to be
mo ticed aod tenDned into the caps and sills.
and each tenon to be pinned with two
tbree-quarter "a inch square iron pirs, and
each bent 70 be braced by two diagonal
braces OF l2X2a inch plank. well fitted and
spiked on caps, posts and sills.
The bepts TO Test or stand upon four mud
sills l2X12 inches and eight ~ feet long set
In the ground and placed on the alignment
of the work.
The carriage way Of the :trestlework to
be sixteen 16) feet wide, the floor plank
{, be three (3) inches and not over twelve
(l2)inches wide, and to be well spiked on
to the siriDgers and floor beams.
The tie0r beams to be made up az follows
two (2) stringcrs Of SXl2 inches set on the
caps and sixteen (lG) feet apart from out.
side to outside. The space between said
siringers to be equally divided for seven
q beams Of aka inches each, and each set
OF floor beams or spans to have taree 90 acts
OF herringbone bridging OF 2X4 inch scsnt.
ling.
The stringers and floor beams 70 rest Of
least Fix 90 inches on the caps.
The stfingers to connect by half FONTS
and 10 be fastened to the caps by one inch
round spikes or bolts eighteen lSl inches
long.
A railing or ballasters four a. feet high
TO be constructed on each side OF above dis.
cribed trestlcw0rk. The posts to be Axe
inch clees and braced on the caps and fasten-
Cd on 10 the st!ipgers by two ~ one.hali
inch bolts. The parts to be six (6) feet
apart; the hand rail 2Xl inches, and an
axle guard Of 2Xl2 inchee, all we'll taste ned
on to the posts.
All OF tho above tlmbers to be OF white
or burr oak of best qua lily, and
the work done in thorough and work
manlike manner, and under the supervision
Of such person as the committee on streets,
or the city council OF the city Of Cairo may
designate.
The approaches to above trestlework and
bridge to be Of earth aud with o slope OF
not moro than one in ten and not less than
sixteen. lG) feet Wide Oh top. with slope
will be received for iron span, including
abutments and foundation, for The wooden
trcs,le portion OF said bridge, and for the
| carthen approaches, or for the entire
work.
!he right to reject any or all bids, is re.
served. j. B. PILLS,
dtd. City Clerk.