The Cairo bulletin. [volume] (Cairo, Ill.) 1872-1878, 1878-01-06
NOTICE TO CONTRACTORS,
OFFICE OF CITY CLERK,
Cairo. Ills Ian. Il. lSTs

Calro, U.s., Jan. u, 1915, |
Sealed proposals will be received at this
, office, directed to the city council of Cairo,
Illinois, until O'Clock tuesday evening,
February 10th, A. ID. 1878, for The cOnstrue-
ton OF Une span iron bridge, together
with the approaches or abutments anu
foundation, across Cache river, about one
ana one iali miles from Mound City raj
ROAD uepoI, and four miles north OF the city
| OF Cairo, In the counties Of Alexander anu
Pulaski, state OF Limos, according TO the
plans and specifications prepared NY John
l.. Heiy, Esq, U. b., now on file and sub
Ject 10 examination IN this office, the speci.
LEGATIONS Of which are Is follows, viz:
oalo orldBe anu trestle work 10 be made
up OF eighteen tls) openings OF eighteen (ls)
ieet Iou centre 10 centre OF posts, anu one
span OF Que un1red Quo feet across the
| river bed.
Tine one hundred 400 feet span to be OF
iron, aud So proportional that load oil ten
| (lUl tons dist. lbuted over twenty (zO) lineal
feet ut the centre OF the span, shall not
strain the Iron over twelve thousand
(l2,0vV) POUNDS per square inch trestle, or
oyer seven thousand live hundred Il 500
pounds per square inch shearing strain,
the STRAIN in compress zion to be IN at
least In the proportion TO the ratio oil
length to diameter, by Gordon's formula.
Inc span OF said bridge TO be one huu-
Died (lUDl leet in the clear and the roadway
twelve az feet wide.
The floor to be OF white oak plank two
and ohe.hali GA inches mick ana not over
twelve az inches wide.
The floor beams to be of white oak and in
proportion " the balance OF the one hun.
ufe- (ltV feet span structure, and also 10
be provided with sultable axle guard.
lhe above 10 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 siil EMP, TWEEN
" l2O) ieet long mortlced and teuoned 10 a
sulhclent number VI white oak pies, firm
iy driven into the river tank.
lREsTLK WORK.
Inc DENTS to BIO formed VI tour posts l0S IL
inches square, the Two inner parts TO stand
perpendicular and the two outer parts to
us framed ana stand at q batter OF one in
eight. The cap aud sill OF the bents TO be
lZAl2 inca square timber, ito cans to be
twenty l2J) feet long, and the stills TO pro-
Ject on each END two ieet past the outer
eJge OF the outside poets. The posts TO be
morliced aud tenOned INTO the caps and stills,
and each tenOn to be pinned With two
tbree-quarter "a inch square iron pirs, ana
each bent TO be brAced ~ two diagonal
braces oil l2AI3 inch plank, well titte anu
spiked on caps, posts and sills.
The DENTS TO rest or stand u Jon four mud
sills l2Al2 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
De sixteen 10y feet wide, the door plank
10 be tbIee tSJ inches and not over twelve
Q?l inches vide, and to be Well spiked on
70 the strngers ana floor beams.
Fac door beams TO be M de up as follows :
two ~ stringers OF SXl2 inches set on the
caps aud sixteen (l6) ieet apart from out
slde 10 outside The space between said
stringers to be equally DIVIDED for seven
@ beams of 3Xl2 inches each and each set
OF floor beams or spans to have tAree (s) sets
OF her. ingbons bridging OF 2X4 inch scant-
ling.
The stringers and floor beams TO rest at