The Cairo bulletin. (Cairo, Ill.) 1???-1928, 1912-12-02
and Shall be Undecided in the said

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ard Shall be Undecided in the said
eHn rcte SO as 70 lateJsett the line OF
a. Irregular curve. distant four ca
INCHES at the bottom. SIX to inches
% each side at the, spring line and
two - ipeheat At the top lnen thf
jnsl ie waH oi the sewer, and the
9anse ahaii be spaced twelve tl2j
inches from center 70 center Said
lran@Yrtee rGd3 snail be hve-eights
t5-@l of ar inch IN diameter and
shalt he imdelded in the s3id con
crte "a the form Of an irregular
curve, di2tant four ca inches at thf
bottom, EiN 80 inches al each sid,
AZ ibe spring ine and teo ~ inehe.
~ We tep from lie ipsiie WaGi Of tho
- ser ANA the carrie snail be spaced
six go inches trom center to center
sad concrete sewer ahail be con
strIetej upon said foundation base
and the inner surface Of the SAID
sewer shall be On the circumference
of a circle six Co feet in diameter
above and tangent to line nine GA
inches above and parallel TO the top
surface Of the said foundation base al
IA point On tho center line OF the said
sever.
The outer surface of said sewer
shail rise vertically on both sides of
said sewer from the outer edge Of
the base TO the spring line Of said
sewer. and above the spring line of
said sewer said outer surface OF said
sewer shall be ON the circumference
OF circle OF seven CD feet and six
co inches diameter conccntric with
the inner surface of the said sewer.
The mlnimNim thickness Of the said
sewer wall shall lie nine CO. inches.
The elevation OF the inside bottom
surface of said sewer shall be equal
in elevation TO the elevation Of the
inside bottom surface of the two
ends Of the old main concrete sewer
in said Commercial avenue against
which the sewer herein provided for
is to abut
Concrete Manholes.
hole shall lie constructed In and upon
a portion OF the said main concrete
sewer herein provided for at the
point where the said main concrete
sewer is intcrseC led bv the center
line OF said Thirteenth street, and
one CD concrete manhole shall be
constructed in and upon portion of
the said main concrete sewer herein
provided for at the point where the
said main concrete sewer IL intersect-
ed by the center line Of said Four
teonth street.
Both Of said mahholes shall be Of
the same size and description in all
respects.
They shall be cylindrical in shape
and shall have an internal diameter
" three 81 feet, except that the up
nor rorTion thereof, two C2) feet in
noight shall be coni2al in shape, be.
lug reduced to two GU feet internal
diameter at the top; the walls of said
manhales shall be six co. inches in
thickness.
Said concrete manholes shall he
built IF concrete mixture composed
OF QGH tll part Of American Port
Land cement and four iiy parts Of
clcln, Tashed. river gravel, in which
shall te Undecided round, derormed,
steel rods both vertically and hori-
2entally. Said round, deformad,
Ttenl 'ds shall be such that the
least eross-section11 area thereof
shall be equal to that of a round bar
Of the required size, and shall develop
an ultimate adhesive or mechanical
bond Of three hundred 5000 pounds
per square inch Of surface. The
steel nsed in said rods shall have an
elastic limit of from thirty-five thou
sand (S5,000) to fifty thousand
t5O.000l pounds per square inch
The steel in said reds shall be Of
such 2 nature that the rods con ho
bent cold one hun lred and eighty
tlS0l degrees around pin Of the
diameter OF twice the thickness of
the rod without causing a fracture on
the outside Of the be;d Said ver-
teal rods shall be threc-eights (3-Sl
OF an inch in diameter and shall be
imbedded In the said concrete so that
III that part of the said manholn
which Is of the internal diameter
of three CD feet, they shall be spaced
six tGl inches from center to center
and shall intersect the circumference
OF a tlrclo forty-tWn (42) inches in
diameter concentric with the inner
surface CT the manholc. In the up
per or conical portion Of the manhole.
the rods Shall be inclined inward at
the same angle Us is provided for IL