The Columbian. [volume] (Bloomsburg, Pa.) 1866-1910, 1893-12-08


al materials used in the work.
No charge shall be made by the
contractor or contractors for hindran-
ces or delays in the progress of the
work, but they may entitle him to an
extension of lime for the completion
OF the work, provided they are of such
a.character as shall be deemed a suf
hcient cause Of such extension by the
Engineer and claim be fled in writ
ing by the contractor or contractors at
the time Of their occurrence.
In case of any dispute or disagree
ment over the Interpretation of any
part of these specifications, the de-
cision of the Engineer shall be final
and conclusive upon all parties.
SPECIFICATIONS OF THE KING BRIDGE
COMPANY.
The various members of the Bridge
shall be made up of the sizes and sec
tlons shown on drawings and strain
sheets.
The structure shall be proportioned
to carry the loads designated on strain
sheet.
QUALITY OF MATERIAL.
IRoN.-The iron shall be tough and
fibrous and when tested IN long speci-
mems shall show an ultimate tensile
strength of from 10000 to $4,000 lbs.
per square inch, and elongation before
rupture of at least twelve per cent, an
elastic limit of at least one half the ul.
innate strength, and reduction of
area at the breaking section of at least
twenty per cent.
Round rods shall bend cold without
sign of fracture until the two halves of
the rod are parallel and at distance
apart equal to the diameter of the
rod.
Flat bars shall bend cold without
sign of fracture until the two halves of
the bar are parallel and at distance
apart equal to the thickness of the bar.
All wrought iron shall be thorough
, ly welded during rolling and Of full
sections at all points, and free from
seams, blisters, cinder spots and i'm
perfect edges.
Rivets shall be made from the best
quality of double refined iron.
All members in the structure shall
be of iron except the ones marked
steel on the strain sheet.
STEEL-All steel shall be uniform
in quality, and shall have an ultimate
tensile strength of from $4,000 to Co.
600 lbs. per square inch, an elastic
limit of at least one half the ultimate
strength. an elongation of not less than
eighteen per cent.
EYE BARS.
All steel eye bar heads will be
formed by upsetting the bar and with
out the use of piling pieces.
All steel bars will be thoroughly an
nealed throughout their entire length.
IRON EYE BARs-Iron bars will have
the heads either upset on the bar oil
upset with plling pieces. No welding
on Of ready made heads will be per
mitted. All eye bar heads will be SC
proportioned that when tested to de
struction, rupture will occur in the
body of the bar rather than in the
head.
The shape of the head shall be sat
isfactory to the Commissioners or theil
Engineer.
WORKMANSHIP.
The workmanship shall be first clas.
throughout.
The pin holes shall be bored truly
in the axis of the bar, and perpendicu
lar to the line of strain.
Bars belonging to the same pane
shall be bored when the iron or stee
is at the same temperature.
No error in the size of the holes OF
length of bar shall exceed one liftietl
of an inch.
Pins shall be turned true to size anC
straight, and shall fit the hole within
one fftieth of an inch. They shall b.
of such lengths as to have full bearing
on all the members they pass through
Rods shall have upset thread end
with section at the root of TIT
, thread, at least ten per cent create
than in the body Of the bar.
All abutting joints shall be SO dressed
as to fit truly against each other. Riv
: ct holes shall not be more than on
: sixteenth of an inch larger than tn
S cold rivcts designed to hll them an'
: shall be so accurately spaced at al
Joints, that the cold rivct can be in
serted without the use OF the drift pin.
e In punching the holes, the diamete
< of the die shall not exceed the diane
: ter of the punch by more than on
e sixteenth Of an inch.
+ The rivets when driven shall con,
pletely fill the holes, and shall hay