The Cairo bulletin. [volume] (Cairo, Ill.) 1872-1878, 1878-01-20
NOTICE TO CONTRACTORS,
VFFICE Of CIF OLkRk,
Cairo, llls., Jan. 3, 1878.

Cairo, llls., Jan. 3, 1878.
Sealed proposals will be received ut this
office, directed 10 the city councilof CAIRO,
Illinois, until O'Clock Tuesday evening,
February 10th. A. d. 1878, for the cOnstruc.
ton OF q one span iron bridge, together
with the approaches or sbutments anu
foundation, Acr0saC Cache river, about one
and one. ,alt miles from Mound City raiI.
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 specifi cations prepared by John
=. Hely, Esq, Z. E., now on file and sub
jeet to examination IN this Office, the speci.
flcations of which are Is follows. viz:
Said bridge and trestle work 10 be made
m nf Aish'nAn 49, openings OF eight en- (IS)
feet from centre to centre OF pots, and one
span OF one hun dred 900 feet across the
river bed.
The one hundred (loO) feet span to be Of
Iron; and so prop0rtOned that load OF ten
(l0) tons dist. ibuted over twenty (z0) lineai
teet at the centre Of the span, shall not
strain the iron over twelve Thousand
~ 0O0) pounds per square inch tensile, or
over seven thousand i've hundred e 5tO)
pounds pei. square inch thearing strain
the strain In compression TO be IN at,
length TO diameter, by 9ordon's formula.
dred tl0O) feet In the clear and the roadway
twelve Ql) feet wide.
The floor to be OF white oak plank two
and oue.half (2a) inches thick and not over
twelve li2) inches wide.
The floor beams to be OF white oak and In
proportion to the balance of the one hun.
dreu 100) feet span structure, and also TO
be provided with q suitable axle guard,
The above to rest upon iron columns pro-
portiOned 10 the structure to be supported,
the columns at each end OF the bent or iron
span TO be placed on mud sill i2Xl2, TWEEN.
~ COY feet long m0rticed and tenoned to q
sufficient number Of white oak piles, firm.
ly driven into the river bank.
1REsTLE WORK.
The bents to be formed offour posts l0X ~
inches square, the two inner parts to stand
perpendicular and the two outer parts to
De framed and stand at batter OF one In
eight. The cap aud sill OF the bents to be
l2Xl2 inch square timber, the caps to be
twenty coy feet long, and the stills to pro-
iect on each end two feet past the outer
edge OF the outside posts. The posts TO be
m0rticed and tenoned into the caps and sills.
and each tenon to be pinned with two
tbree.quarter ~ inch square iron pirs, and
each bent 10 be brsced by two diagonal
braces OF 12Xz4 inch plank, well ttted and
spiked on caps, posts and stills.
The bents to rest or stand upon four mud
stills l2Xl2 inches and eight (s) feet long set
in the ground and placed on the alignment
of the work.
The carriage way OF the :trestlework TO
be sixteen t16) feet wide, the floor plank
70 be tbI oe t3) inches and not over twelve
Q?) inches wide, and TO be well spiked on
TO the stringers and floor beams.
TAe moor beams TO be made up as follows !:
two (2) stringers Of sXl2 inches set on Tho
caps and sixteen Q8) feet apart from out.
side to outside. The space between said
stringers to be equally divided for seven
~ beams Of Okla inches each and each set
Of noor beams or spans to have three (Sl acts
OF herfingbone bridging OF 2X4 inch scsnt.
ling.
The stringers and floor beams to rest at
least six (6) inches on the caps.
Inc stflngers to connect by half FONTS
and 10 be fastened to the caps by one inch
round spikes or bolts eighteen (1s) inches
long.
A railing or ballssters four (4l feet high
10 De constructed on each side OF above dis.
cribed trestlework. The posts 10 be axe
inch clees and brsced on the caps ana fsstsn.
ed on to the striDgers by two (2) one.haIf
inch bolts. The parts to be six (fl feet
apart; the hand rail AKA inches, and an
axle guard Of 2Xl2 inchsp, oil well taste ned
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 . thorough and work
manlike manner, and under the superyision
OF such person % the committee on stree ts.
Or the city council. OF the city Of Cairo NAV
The approaches to above trestlework and
bridge TO be Of earth and With Q slope Of
nov more than one In ten and not lsti than
sixteen le) feet wide on top, with : slope
70 tne bsse Of one In two. Sepsrste BIDS
WI DO received for iron span, includine
aoutmenb and foundation, for The Wooden
ttestle portion Of said bridge, and for the
carmen a!a approaches, or for the entire
IT. The RICH, to rsjss. any q al bids, u 70.
'' s,s' J.B. Paniis,
wa Guy Clara.