The Cairo bulletin. [volume] (Cairo, Ill.) 1872-1878, 1878-01-29
NOTICE To CONTRACTORS.
OFFICE OF CITY CLERK

Cairo, Ills, Jan. 0, 1878. J
Sealed proposals " III be received at this
Office, directed TO the city council Of Cairo,
Illinois, until o'clock Tuesday evening,
February 9th, A. ID. 1873, for the c0nslruc-
ti0n OF one span iron bridge, together
with the approaches or sbutments and
foundation, across Cache river, ubou, ono
and one lalt 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, accordin. 10 the
plans and specifications prepared by John
2. Hely, Esq, Z. t., now on file and sub
jectto examination IN this Office, the epeci.
ticatlous Of which are as follows, vjs
Said bridge and trestle work o be made
UP Of eighteen u.s. openings Of eighteen ~
feet from centre TO centre OF 20 rs, snd one
span OF one hun 1red lGo) feet across tho
river bed.
The one hundred 900 feet spsn I, be OF
iron, and 50 proportloned that a load OF ten
(lU) tons dist iblted over twenty t20J Inca
teet at the certre Of the span, shall not
strain the iron over twelve thousand
| ~ 0o0) ROUNDS per square inch tensile, or
over seven thousand i've hundred II so
pounds per square inch shearing strain
the straln in compression to be In a.,
Leaf In the proportion 70 the ratio OF
length TO diameter, by dordon's formula.
Tue span OF SAID bridge TO be one nun
ed (l0D feet in the clear and the roadway
twelve (l2) feet wide.
The floor to be OF white oak plar k two
and O4e-hsii (23)in,bes thick und not over
twelve (,2l inches vide.
Tn: tl1Or beans to be OF v bite oak aud ia
rroIo iun ~ the b-lan, " The one hun.
die- Il o. ieet AL structure, and also 10
| b. prcylaei with tuitsDle axle qua d.
he alb We To ret upon iron co.umBs pro.
pJltinneG o the 81 uctuie to b, Supported,
the columns ii vacl ind 0 tie bent or ir Ia
| span u be place On mud Ill KIP. tweI-
(20) Ieet long mortic, Il AID l. zone, I a
sufficient numoei II white OAK pies, Grm.
| iy urlyen into tbs river janS.
qREeTLE WORK.
| The bents 10 b., .oIncd uiiyur posts iGXt P
inches qulre, The Two inner parts 10 Ill q |
| perpe Bdicuiar and the Two QUITE part 10
~ ramed ana stand n Il batter Of "ne In
eight The cap q sill OF the bents to be
2Al2 me square tim er, I e caps 10 DO
twenty q } Ieet pg. AMI the slis 10 pro-
)ec! n eGcn mt two iett past the outer
&c oil iae on side po Is. lie post 10 be
mo ticeta dtenoned lnto the caps and sil.s,
and each tenOn 10 be pinned with two
tbree-quarter a. inch square iron pirs, AMI
each benz t. be br4crd y two diagonal
braces OF l2XZ3 iHch plank, we'll att. u AMI
srined IN caps, posts and sills.
The bents TO rest or stand u on four mud
silIs l2Al2 inches AID ght ~ feet long set
in the ground and placed on the alignment
Of the WORK.
The carriage way Of the :trtsilew work to
be sixteen (ln) feet wide, the floor plank
be tDIee (3j inches and not over twelve
n IN v..i1 do a IN, hn
TO The srngers anu floor beams.
lac floor beams TO he m de up as 70 ll0ws !:
two (2) stringers OF SHE inches set on the
caps and sixteen Q6) ieet apart from out
SIDE 10 outside he space between said
.tringPrs to be equ4lly diyi ed Tor seven
~ beams Of 3Xle inches each and each set
OF floor beams or spans to have three (:) sets
o. her inVbons bridging OF 2X4 inch scant-
ling.
The stringeis and floor beams to rest at
lesst xix (6) inches Or he caps.
The stEiDgers to connect by half JOINTS
and 10 be fastened TO the caps by one inch
round spikes or bolts eighteen ls inches
long.
a railing or balasters four a. feet high
TO be constructed on each side OF above dis
cribed trestlework. The posts TO be Axe
inch clees and brnced ON the caps and fasten-
ed on to the stIingers by two (2) one.half
inch bots. The parts to be six Coy feet
apart; the hand rail 2X4 inches, and an
axle guard of 2Xl2 inches, all well fastened
on to the posts.
All Of the above timbers to be OF white
or burr oak OF bes, qua lily, and
the work done in q thorough and work
msnlike m iDner, and under the supervision
Of such person IS 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 and with slope OF
not more than one In ten aud not less than
sixteen (l6) feet wide on top, with o slope
TO the base of one In two. Separate bids
will be received for iron span, including
abutments and foundation, for the wooden
trestle portion OF said bridge, and for the
earthen approaches, or for the entire
work.
The right 10 reject sny or ali bids, Is re-.
| served. J. h. PHILLIe,
dtd. City Clerk.