The Port Gibson reveille., 1913-07-17

that the diameter at the bottom Of
the threads shall be I I6 of an inch
larger than the BODY of the bar; or
a rod OF sufficient size may be used
to have the required area at bot
tom of the threads.
Bed Plates-Bed plates Of such
dimensions that the greatest pres
sure on the masonry shall not ex-
ceed 400 lbs. per square inch.
Material-All material TO be best
quality medium steel. vxcept weld
ed bars. which shall be either seft
steel or iron.
Steel-All steel bars, plates and
shapes must be free from cracks on
the faces and corners and have a
clean, smooth finish. Tests must
be made from samples at least
twelve inches long. with sectional
area Of not less than half square
inch, same to be cut from the 6n-
ished material after rolling. Medi-
um steel shall have an ultimate
strength of from $4,000 to $4,000
lbs. per square inch; and an elastic
limit of one-half of the ultimate
strength and an elongation not less
than twenty per cent In eight inch
es. Before or after heating to a
low cherry red and cooling in water
at So degrees Fahrenheit, his steel
must stand bending to curve
whose inner radius is one half time
the thickness without cracking.
Lumber-Lumber to be of good
quality Long Leaf Yellow Pine. 90
per cent heart, free from large or
loose knots. windshakes, decayed
wood, or any other defect impair
Ing Its strength and durability.
The dimensions shall be as given
! on the strain sheets. The plank
} will be laid cross.wise with inch
opening aud securely spiked tc
joists and mailing strips. The
wheel guard shall be laid fiat OF
: the floor plank and securely fas
tened with hook bolts to outside
joists spaced about 81 O. on centeis
S Painting-All machine surfaces
to receive at the shop one gooc
! coat of white lead and tallow. AL
e other accessible surfaces to receive
: at the shop one coat of Graphit,
e Paint, and another after erection
Before painting at the shop al
: metal work shall be thorough,
cleaned from all loose scale anc
T rust.
. Erection-The contractor to fur
$ nish all tools and material for tIi'
E erection Of the bridge and remove
E all false work when the erection !.
! completed.
Workmanship-Wo Workmanship Il
c be first class in every particular
e but the contractor shall not be re
quired to perform any work no
/. mentioned in these specification
and plans.
Inspection-Inspection of the
work shall be made as 1t progresse.
and at as early period as the ma
ture of the work permits. .zz
Concrete-The CONTRACTOR shall
make all excavations for abutments
and pedestals and provide suitable
forms for retaining the concrete in
proper position until it has thor
oughly set. All abutments and
pedestals shall be of the diners
sions shown OIL the plans, concrete
to be composed of one part cement,
three parts sand and six parts
stone or gravel, one barrel of ce-
ment to each yard of concrete In
place shall be assumed equivalent
to the above proportions.
Cement-Cement shall be first
class American Portland of All ap-
proved brand having an established
reputation for strength and dura-
bility, and conform to the specifi-
cations of the American Society for
testing materials.
Sand-The sand shall be clean
and sharp and free from loan In
sufficient quantity to impair the
strength OF the mortar. The course
material may be either clean gravel
or broken stone not exceeding 21z
in. In size. Where clean gravel
can be obtained containing from so
| 80 - < 49, ca,,t co,,d ttfe