The Jersey City news. (Jersey City [N.J.]) 1889-1906, 1898-07-14

up AHA SlAOOllG1 ana HldiS Qi1ii0fu1
throughout with Rosendale cement con-
crete. surfaced with a layer two inches
thick OF Portland cement mortar. Where
the tunnel Is n earth or uns9und TocR
be laid at the bottom. Ii II shall bt
necessary. IN order to secure firm fuunda-
of concrete. Care shall be taken TO leave
the interior surface of the tunnel smooth
and free from G pleJee1 9RmN
If iron castings are used for effluent
pipe, manholes, blow-offs. air-yalves and
other connections, the metal must be re-
melted in a cupola or air furnace, ana
must be of pig-iron, without any adInlX-
ture of cinder iron or other inferior metal,
and shall be of a strong, rough character,
of an even grain, entirely free from IN
croscope, and such as will bear satisfac-
tory drilling and cutting.
The iron for the castings shall lave a
tensile strength of at least seventeen
Thousand pounds to the square inch.
Test bars, twenty-six (26) inches long,
two N) inches wide and one "a inch
upon supports twenty-four .(24) inches
apart shall bear a steadily increased
centre load up to nineteen Qy1ol
pounds before breaking, and shall exhibit
a. defIeetion Of not less thar fve-six-
teentbs of an inch.
The castings shall be perfectly free from
Scoria, SandhoIes, air bubbles and other
defects and inperfections.
The castings shall be perfectly cleaned
and no Jumps shall be left IN the inner or
on the outer surface.
dressed and made clean and free from
earth, sand and dust, which adheres to
the iron in the %rnoulds; iron wire brushes,
must be used as well as softer brushes,
to remove the loose dust. No acid or
other liquid shall be used in cleaning the
castings.
cleaned, according to the specifications
and the directions of the Engineer, shall
be subjected to a careful and thorough
hammer inspection.
Every pipe or casting shall be care
fully coated inside and out with coal tar
pitch and oil. Before the coating is APP
piled the casting must be entirely freed
from all rust.
In case the castings cannot be dipped
Immediately after being cleaned. the sur
face must be oiled to preserve it until
dipped after rust has set in.
The coal tar pitch to be made from
coal tar, distilled until the naptha is en-
tfrely removed and the material deodor-
lied with a mixture of 5 to c per cent, Of
linseed oil. Pitch, which becomes hard
and brittle when cold. will not answer Tor
this use.
pitch OF the proper quality having beer
obtained, it must be carefully heated IN
a suitable vessel to a temperature OF 3u
degrees Fahrenheit. and must be main
tanned at not less than this temperature
during the time of dipping.
The material will thicken and deteTl-
crate after a number of pieces have been
dipped; fresh pitch must therefore be fire.
ouently added, and occasionally the yes
SCI must be entirely emptied Of its old
contents and refiled with fresh pitch.
Every casting must attain a temporal
turc Of 300 degrees Fahrenheit before be-
ing removes from the vessel OF not pltcf.
II may then be slowly removed and al
low ed to drip.
But no castings shall be dipped until the
INSPECTOR -pronounces it passed, as 10
rust, hammer test, etc, when 1t may
tficri be dipped. The proper coating must
be tough, and tenacious, when cold on the
castings and not brittle, or with any ten
dency to scale off.
Every length of cast iron pipe shall he
tested to a pressure of 800 pounds per
square inch, and under such pressure the
pipe shall be subjected to a series Of
blows at various points with a three
pound hammer.
WROUGHT IRON.
Al. wrought iron used must be tough,
ductile and fbrous, of uniform quality,
free from crystalline structure, cindess.
flaws or cracks. In bars it must have
an ultimate strength of $4,000 pounds per
square inch. with 5000 pounds elastic
limit, and an ~elongabion of twenty-five
per cent. in eight inches.
Angle iron must have an ultimate
strength of As, 900 pounds per square inch,
24,G0o pounds elastic limit, with twenty per
cent. elongation in eight inches.
STONE MASONRY.
Unless otherwise specified, all stone
masonry is to be built of sound, clean
quarry stone, of a quality and size sat
is;actory to the Engdneeri all joints 10 ne
full of mortar.
bubble stone masonry shall be nude
of stone OF suitable size, quality and
shape for the work in hand, and pre-
serting good beds for material of that
class. Especial care must be taken to
have the beds and joints full of mortar,
and nr %grouting or filling of joints after
the stones are i'm place will be allowed.
work must be thoroughly bonded
Where rubble stone masonry is used in
dams the stones must have roughly rec
~taIgular forms, and all irregular projec-
tons and feather edges must be ham,
mereG off. Their beds especially must be
good and present even surfaces. When
a stone is lowered on the. surface pre-
pared to receive it there must be no Doubt
tina the mortar will fill all spaces. No
spaWls shall be inserted beneath a stone
so placed. but a moderate quantity may
be used in preparing suitable surfaces
for receiving other stones. If they are
eidirely embedded in mortar Various
SIZES of stone must be used and regular
ccursing be avoided in order to attain
ver ticai as well as horizontal bonding.
SPACES of six inches or more in width be-
tween the stones may be occasionally
filled with concrete carefully rammed.
Masonry which is to receive he shock
OF water and ice, such as on the aprons
OF spillways is to be composed of large
blacks and is to be especially sound, hard
and compact and of durable character.
No joint shall be more than one incn
wide. The exposed faces of all masonry
dams and gate chambers shall be Equal
III appearance and quality to that of the
Macopin intake dam of the Newark water
works. The facing stone masonry shall
have all beds, builds and Joints true to
a depth of not less than three inches.
or more than four inches from the facings
and the joints shall not exceed one-half
inch in width. The rise OF the courses
may vary from bottom TO top from thirty
inches to fifteen inches, decreasing grad
ually toward the top of the wall, and the
width of the bed of the stretchers is not
to be at any point less than twenty-eight
inches. The headers are to be not less
than four feet in length, each course to
be composed of two s~tretchers and one
HEADER alternately.
All faced Joints shall be raked out to s.
depth OF one and one-half inches and
carefully pointed with Portland cement
mortar mixed clear.
Granite dimension stone masonry is to
be used for copings of dams and for the
gate openings in the gate chambers. It
must be made of first class granite, free
from seams and other defects. The stones
shall be cut to exact dimensions and all
angles and ARISES shall be true, we'll de-
fined and sharp. All beds, builds and
Joints are to be dressed for the full depth
of the stone to surfaces, allowing of one
quarter inch Joint at most. The stone
shall be laid with quarter inch joints,
and all face joints shall be pointed with
mortar made of clear Portland cement,
pplied before its first setting. All joints
to be raked out to a depth of one and
one-half inches before pointing
1t Is not intended to compel the use OF
quarry stone masonry laid IN cement
where dry stone masonry Is sufficient, in
tho Underwent of the Engineer.