The Jersey City news. (Jersey City [N.J.]) 1889-1906, 1898-02-02

and occasionally the vessel must ne entirety
emptied Of its old contents and rehfled with
fresh pitch.
every casting must attain a temperaturs q
900 degrees Falranheit before being remover
from the vessel Of hot pitch.
y may then be SLOWLY removed and aiio"ea
But no casting shall be dipped until the In
specter prohounces It passed, as to rust, nam
m ne test etc. when II may then pc dlppea.
cious, when cold ON the castings, and not 1prlt-
tie. or with any tendency to scale oil. ..a
every length of cast iron pipe shall be TESTED
to a pressure Of 800 pounds per square men
Jected to a series of blows at various points
with. a three-pound hammer.
WROUGHT IRON.
NJ wrought iron used must be tough, auc-
tie ana hbrous, OF uniform quanty, Tree iaI III
crystalline structure, cinders, flaws or cracks:
In bars it must have an ultimate strength o.
5000 pounds per square inch, with zo.y'9
pounds elastic limit. and an elongation OF TWEEN
ty-hve per cent. in eight inches
Angle iron must have an ultimate strength
81 AZ 5000 pounds per square inch, 2,uVo pounus
elastic limit, with twenty per cent. eiongatleh
STONE MASONRY.
Unless otherwise specified, all stone masonry
a quality and size satisfactory to the En-
sinser; all points to be full Of mortar
stone Of suiHxple size, quality and shape ,i for
for material Of that class. Especial care
must be taken 10 have the beds ana JOINTS
join q AFTER mer'a The an ston ee gre N place lac viii " be
allowed. The work must be thoroughly pohu-
Where rubble stone masonry is used in dams
the stones must have roughly rectangular
forms, and all Irregular projections and featnef
edges must be hammered off. Their peds es-
peclaiiy must be good and present even SUI
races. When a stone is lowered on the sur
doubt pt thea fpe 70 n,o receive wil Il a rhe ri m apaees. No
spawls shall be inserted beneath a stone
SO placed, but a moderate quantity may ne
used IN preparing suitable surfaces Tor re-
ceivlng other stones, IL they are entirely en-
bedded in mortar. Various sizes OF stone
must be used and regular coursings be avoid
ed in order to attain vertical az well as horl-
zontai bonding Spaces of six inches or more
in width between the stones may be occa-
slonally filled with concrete carefully rammed.
Masonry which is to receive the shock OF
water and ice, such as on the aprons OF spill,
is TO be especially sound, hard and compact
and OF a durable character. No joint shall DE
Of all masonry dams and ga~te-chambers shall
be equal in appearance and quality to that
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 theN
Joints shall not exceed one-halfl inch in width
The rise OF the courses may vary from bottom
creasing gradually toward the top of the wall,
and the width of the bed of the stretchers is
not TO be at amy point less than twenty-eight
lnches. The headers are to be not less than
four feet in length. each course to be COM
posed OF two stretchers and one header alter
All face joints shall be raked out to a depth
Of one and one7half inches and carefully point
ed with Portland cement mortar mixed clear.
Granite dimension stone masonry is TO be
used for copings of dams and for the gate
op saa g n sr the gate.ehambers It. must be
and other defects The stones shall be cut
to exact dimensions and all angles and
An 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 NOR
Ssfor ma lie f Of e les,,na Portland iai lo, cement IN he ap ppned
out to a depth of one and one-half inches be-
fore pointing.
ry stone masonry laid in cement where dry
stone masonry is sufficient, in the judgment
of the Engineer.
The contractor shall submit samples of the
ingredients and the proportions thereof to be
USED IN mixing mortar for the work, to the
Engineer, a sufficient time in advance of their
use, to permit OF suitable tests being made to
determine whether the mortar SO made con-
forms to the specifications. If, for any cause,
the Engineer finds it impossible to make such
tests, then only such ingredients and proper
tons shall be used as in the opinion of the
Engineer will produce mortar conforming to
the specifications.
All sand used shall be clean and sharp, free
from pebbles.
Mortar used in concrete core-waIls of earth
dams, in the foundation and main body of
masonry dams, in the concrete backing of
tunnels. etc, shall show a tensile strength of
at least twenty-five POUNDS per square men
of section at the end of one week. fifty pounds
per square inch of section at the end of one
month, and 125 pounds at the end of six
months. and may be composed of one part
iRosendale cement and two parts sand, or
such other ingredients or proportions as will
produce a mortar of the above strength.
Mortars used in the brick lining of tunnels,
the walls of gate-chambers, in dimension
ed situations shall show a tensile strength of
at least 100 pounds per square inch of section
at the end of one week, $50 pounds per square
;nolI of tho or1 of IN month op1 o5Q po,,ndc
at the end of six months, and may be com
posed of one part Portland cement to two
parts of sand, or such other ingredients or
proportions as will produce a mortar Of the
above strength.
of neat Portland cement, moderately slow set
ting. and shall show in one week after set
ting two hours in air and the remainder of
the time in water, a tensile strength of at
least $50 pounds per square inch of section.
When tested in cakes all cement shall be
free from cracking at the edges.
No mortar shall be mixed in advance of it's
immediate use. and none shall be used which
has begun to set.
dry, by repeated turns and until the mass
has become homogeneous and of uniform
color. A proper proportion of water shall then
be added and the whole quickly mixed.
CONCRETE.
The stone shall be broken so that the greater
diameter shall not exceed three inches. 1t
shall be sound and clean. The stone shall be
wet with water and then thoroughly mixed
ner that ali surfaces are covered and all voids
filed with mortar, but not more than three
parts of stone shall be added to one part of
mortar. All material must be actually meas
Concrete must be Immediately deposited in
the work after mixing and placed carefully.
tt must not be dropped from a height. 1t
shall be laid in horizontal layers, not ex-
oeeding nine 90 inches thick, and thoroughly
.rammed until the stone is covered with NOR
tar. and until a film of water appears on the
surface. All surfaces upon which concrete is
laid must be wet before depositing the con-
crete. Plank or timber forms must be EN-
Moved where necessary to contine the concrete
to the shape and dimensions shown in the
plans. ,,rc1 1yapy
The best quality of whole, new brick. burn
ed hard entirely through, free from injurious
cracks. and with even, true and smooth faces,
with a crushing strength of 1000 pounds per
sn,,are inch, must be used. Every brick must
he laid in fun mortar joints on bottom, sides
and ends. not exceeding three-eightas of an
inch thick, All brick work shall be properly
bonded. nA,nc
Tho i'm soil and all vegetable matter shall
he removed from the area to be covered by
earth dams. This area shall be cleared, to the
satisfaction of the Engineer, and the material
removed therefrom, which is sufficiently free
from vegetable matter, may afterwards be
used for building the outer toe of the dam.
4 concrete core-wall Of a proper thickness
s1an extend the entire length of the dam and
from the high water level down into the mate
rial underlying the embankment to sound rock
or some other imperyious material
carefully selected of the best materials, mix
Cd. If necessary, to SECURE iaperyiousness to
water. The earth snail De spread upon the
advertisement in level layers. not exceeding six
inches in thickness, and narrowed. wet down
and rolled so. as to be thoroughly compact.
The slopes of embankments shall not be
they shall be finished true and smooth and
nrofected on the water side with suitable