The Cairo bulletin. [volume] (Cairo, Ill.) 1872-1878, 1878-01-05

| - e'S eNe-Ns '"y ssAsfsS' $50 Ss'H~ s'.N
st. Louis road, when running, is great
benefit and convenience to the business
community here, and all desire Its sue
cess; but at the same time our people are
not willing that the company shall COB.
BILE up everything within sight without
even so much as saying "by your leave"
NOTICE TO CON rRACTORs.
OFFICE OF CITY CLERK,
Cairo, Ills, Jan. ., 1878,
Sealed proposals will DO received at this
Office, directed to the city council Of Cairo,
Illinois, until O'Clock Tuesday evening,
February 10th. A. d. 1878, for the construc-
ton of one span iron bridge, together
with the approaches or sbutments and
foundation, across Cache river, about one
and one-ialf miles from Mound City raj
road depot, and four miles north OF the city
OF Cairo, 10 the counties of Alexander and
Pulaski, state Of Illinois, according to the
plans and specifications prepared by John
p. Hsly, Esq, G. f., now on ale and sub
ject to examination In this office, the speci-
| locations Of which are as follows, viz
Said bridge and trestle work 10 be made
up Of eighteen u.s. openings OF eighteen (ls)
| feet from centre 10 centre OF posts, and one
span Of one hundred 400 feet across the
river bed.
The one hundred (l0O) feet span to be Of
iron, and so proportioned that a load Of ten
Q0) tons distributed over twenty (2O) lineal
feet at the centre Of the span, shall not
strain the iron over twelve thousand
"a, oOo) pounds per square inch trestle, or
over seven thousand i've hundred & 500
pounds per square inch shearing strain,
the strain in compression to be In at
least in the proportion to the ratio Of
length to diameter, by Gordon's formula.
The span of said bridge to be one hum
dred 400 feet in the clear and the roadway
twelve (i2) feet wide.
The floor to be OF white oak plank two
and one-half (2i) inches thick and not over
twelve I2) inches wide.
The floor beams to be Of white oak aud 10
proportion to the balance Of the enc hun.
dfeu 400 feet span structure, and also to
BIZ provided with suitable axle guard.
The above to rest upon iron columns pro.
portioned to the structure to be supported,
the columns at each end Of the bent or iron
span to be placed on mud sill I2Xl2, TWEEN.
iy (9O) feet long morticed and tenonsd to
sufficient number OF white oak piles, firm
ly driven into the river bank.
1REsTLH WORK.
The bents to be formed offour posts l0Xlo
inches square, the TWO inner parts to stand
perpendicular and the two outer parts to
be framed and stand at batter of one in
eight. The cap and sill OF the bents to be
l2Xl2 inch square timber, tae caps to be
twenty (20) feet long, and the stills to pro-
ject on each end two feet past the outer
edge Of the outside posts. The posts to be
mortioed and tenoned into the caps and stills,
and each tenon to be pinned with two
tbree-quarter ~ inch square iron pirs, and
each bent to be braced by two diagonal
braces OF 12X54 inch plank, we'll fitted and
spiked on caps, posts and slls.
,3The bents to rest or stand upon four mud
ellis 12X12 inches and eight (s) feet long set
in the ground and placed on the alignment
OF the work.
The carriage way Of the trestework to
be sixteen 49, feet wide, the floor plank
10 be three ~ inches and not over twelve
tl?) inches wide, and to be we'll spiked on
to the s,ringers and floor beams.
The floor beams to be made up as follows:
two ~ stringers of sXl2 inches set on the
caps aud sixteen (16) feet apart from out.
side to outside. The space between said
stringers to be equally divided for seven
u beams Of 3Xl2 inches each, and each set
Of floor beams rspsns to have three (s) sets
OF herringbons bridging OF 2X4 inch scant.
ling.
The striugers and floor beams to rest at
least six (6) inches on the caps.
The stringsrs to connect by half JOINTS
and to be fastened to the caps by one inch
round spikes or bolts eighteen u.s. inches
long.
A railing or ballastsrs four az feet high
to be constructed on each side OF above dis
cribed trestlework. The posts to be Axe
inch clees and braced on the caps and fasten.
ed on to the stringers by two (2) one.hslf
inch bolts. The parts to be six (8) feet
apart; the hand rail AKA inches, and an
axle guard Of aka inches, oil well fastened
on to the posts.
All Of the above timbers to be OF white
or burr oak Of best quality, and
the work done In thorough and work
manlike m amer, and under the supervision
Of such person O. the committee on streets,
or the city council OF the city of Cairo NAV
designate.
The approaches to above trestlework and
bridge to be of earth and with q slope OF
not more than one In ten and not lees than
sixteen (l6) feet wide on top. with slope
TO the base Of one in two. Bids will be re.
oeived for bridge, abutments or foundation
separately, or for the whole work.
The right to reject any or all bids, Is re.
served. J.R. PH1LLIs,
dtd. City Clerk.
RIVER NEWS.