The Cairo bulletin. [volume] (Cairo, Ill.) 1872-1878, 1878-02-06
NOTICE TO CONTRACTORS.
OFFICE OF CITY CLERK,
Gair0 lila Ian 1913


Sealed proposals will be received at this
office, directed TO the city council of CAIRO,
Illinois, until O'Clock Tuesday evening,
February 9th. A. ID. 1878, for the construc-
ton OF one span iron bridge, together
with The approaches or abutments ana
foundation, across Cache river, about one
and one ali 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, accorGing 10 tho
plans und specifications prepared by hn
p. Holy, Esq, U, h., now on file and sub
ject to. examination In this office, the speci-
ications Of which are v Jliows, viz:
Said bridge and treste work O lie made
up of eighteen iiS) op. mugs OF eight EN- (lS)
iet iToD centre to centre OF 20 u, and one
span OF one hun ired tlVO) Ieet ross The
river bod.
The Que hundred COO ieet spsn I, be of
ron, aud So proporroned that LOAF OF ten
(lO) tons dist ibuted over twenty coy lineal
ieet ut the centre OF the span, shall not
| strain the iron over twelve thousand
| ~ 0O0) pounos per square inch tensile. or
over seven thousand i've hundred Il 500
pounds per square inoh shearing strain
| the strain in compIes ion TO be In At,
| lea in the proportion TO the ratio of
length TO diameter, by GordoD's formula.
The span OF said bridge to be one hun
Died lO0) feet in the clear and the roadway
twelve (l2) feet wide.
The floor 10 be OF white oak plank two
| and oLe-halt (2D inches thick and not over
| twelve (l2) inches wide.
The floOr beams to be OF white oak and In
proportion ~ the balance of the one hun.
DIE. tlC0) feet span structure, and also to
| be provided with u suitable axle guar d..
The ab We to rest upon iron columns pro-
porti0Ued 10 the structure TO be Supported,
| the columns at each end OF the bent or iron
span TO be placed ON mud sill .2Xl2, TWEEN.
| ~ COY feet long morticed and tenoneh to q
sufficient number Of white OAK piles, tirm.
| ly driven into the river tank.
| IREsTLE WORK.
The bents TO b. formed offour posts l0Xl
inches square. the TWO inner parts to stand
perpendicular and the two outer parts to
% framed and stand a. batter Of one in
eight, The cap aud sill OF the bents to be
l2Al2 inca square timber, the caps to be
twenty (2) teet long. and the sills to pro-
ject on each end two ieet past the outer
e0ge of the OH side posts. The posts TO be
mo ticed aud tenoned into the caps and stills,
and each tenon 10 be pinned with two
tbree-quarter "a inch square iron pirs, and
each bent to be braced Two diagonal
braces OF l2X21 inch plank, well little and
spiked on caps, posts and sills.
The bents to rest or stand upon fonr mud
sills l2X12 inches and eight t8) feet long set
in the ground and placed on the alignmen,
| of the work.
The carriage way Of the :trestlework to
be sixteen (18) feet wide, the floor plank
| o be tbIee 81 inches and not over twelve
| Q2) inches wide, and to be well spiked on
10 the stringers and floor beams.
/ d. l. No., "A H..
two (2) stringers Of 8Xl2 inches set ON the
side to outside. The space between said
stfingers to be equA ally divided for seven
| (7) beams Of 3Xl2 inches each and each sci
| OF floor beams orspans to have tAree (S) sets
OF her 'ingbone bridging OF 2X4 inch scsnt.
| ling.
| The stringers and door beams TO rest q,
least Fix 10y inches on The caps.
| The stringers to connect by half FONTS
and 10 be fastened to the caps by one inch
round spikes or bolts eighteen QS) inche,
long.
A railiog or ballasters 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 stIingers by two (2) one.hali
inch bolts. The parts to be six (8) feet
l oPnA'S tho GAt iuCuCSs auu III
axle guard Of 2Xi2 inches, all we'll taste ed
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 m inner, 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 trestle work and
bridge to be Of earth aud with q slope. OF
not more than one in ten and not les than
sixteen u6) feet wide on top, with Q slope
10 the base Of one In two. Seperite bid,
will be received for iron span, including
abutments an foundation, for The wooden
trestle portion OF said bridge, and for the
earthen approaches, or Tor the entire
work. tr-
The right to reject any or all bids, is re-.
served. b. PHILLIS,
dtd. City Clerk.