The Jersey City news. (Jersey City [N.J.]) 1889-1906, 1898-01-11


ana the material deedorized with 9 mixture Of
Z to. 6 per cent. Of linseed Oh. Pitch, which
becomes hard and brittle when cold, VIII not
answer for this use.
tanned, it must be carefully heated IN a SUIT
able vessel to a temperature OF 300 degrees
Fahrenheit, and must be maintained at nor
less than this Temperature during the time OF
dipping.
after a number Of pieces have been dipped
fresh pitch must therefore be frequently added.
and occasionally the vessel must be entireiy
empfied Of its old contents and refiiled Win
fresh pitch.
Every casting must attain a temperature q
800 degrees Fahrenheit before being removed
from the vessel OF hot pitch.
1t may then be slowly removed and allowed
to drip.
But no casting shall be dipped until the In
spector pronounces it passed. as to rust, ham
mer test. etc. when it may then be dipped.
cious, when cold on the castings. and not brit
tie. or with any tendency to scale off.
to q pressure of 300 pounds per square inch
and under such pressure the pipe shall be SUD
Jected to a series of blows at various points
with a three-pound hammer.
WROUGHT IRON.
All wrought iron used must be tough, que
tile and fbrous, OF uniform quality, free from
In bars it must have an ultimate strength OF
$4,000 pounds per square inch, with 2b,ooo
pounds elastic limit, and an elongation OF TWEEN
ty.nve per cent. in eight inches. :.
Angle iron must have an ultimate strength
OF 4s.000 pounds per square inch, 24.0V0 pounos
elastic limit, with twenty per cent. elongation
STONE MASONRY.
Unless otherwise specified, all stone masonry
is to be built of sound. clean quarry stone. OF
a quality and size satisfactory to the En-
gineer; all points to be full of mortar. !.
hubDle stone masonry shall be mace OF
stone of suitable size, quality and shape for
the work in hand, and presenting good beds
FOR material of that class. Especial care
must be taken to have the beds and joints
run OF mortar. and no grouting or filing OF
allowed. The work must be thoroughly bond
Where rubble stone masonry is used in dams
the stones must have roughly rectangular
forms. and all Irregular projections and feather
edges must be hammered off. Their beds es-
pecially must be good and present even sur
faces. When a stone is lowered on the sur
race prepared to receive 1t there must be no
aoun5 that the mortar will fill al spaces. NO
SO placed. but a moderate quantity may be
used in preparing suitable surfaces for re-
bedded in mortar. various sizes of stone
must be used and regular coursings De avoid
zontal bonding. Spaces Of six inches or more
IN width between the stones may be occa-
sionally filled with concrete carefully rammed;
masonry which is to receive the shock or
water and ice, such as on the aprons OF spill
ways, Is to be composed Of large blocks and
Is to be especially sound, hard and compact
and of a durable character. No joint shall be
more than one inch wide. The exposed faces
of all masonry dams and gate-chambers shall
be equal in appearance and quality to that
OF the Macopin intake dam of the Newark
water works. The facing stone masonry shall
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, de-
creasing gradually 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 mot less than
four feet in length, each course to be COM
posed OF two StretcherS and one header alter
nately.
All face joints shall be raked out to a depth
of one and one-half inches and carefully point
ed with Portland cement mortar mixed clear.
Granite dimension stone masonry is to be
openings in the gate-chambers. 1t must be
made Of frst-class granite, free from seams
to exact dimensions and all angles and
ARISES shall be true, well defined and sharp.
Al 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
tar made of clear Portland cement, applied
before its first setting. All joints to be raked
OUT to a depth of one and one-half inches be-
fore pointing.
1t is not intended to compel the use of quar-
ry stone masonry laid in cement where dry
stone masonry is sufficient. in the Judgment
of the Engineer.
MORTAR.
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 sufnc1ent 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. II, for any cause,
the Engineer finds it impossible to make such
tests, then only such ingredients and proper
tions shall be used as in the opinion of the
Engineer Will produce mortar conforming to
All sand used shall be clean and sharp, free
from pebbles.
Mortar used in concrete core-walls 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 inch
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
Rosendale 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 q tensile strength of
at least 100 pounds per square inch of section
inch at the end of one month, and $50 pounds
at the end of six months, and may be com
| parts of sand. or such other ingredients or
proportions as will produce a mortar of the
above strength.
Mortars used in pointing shall be composed
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 its
| 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
| with the mortar in such proportions and man
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
ured in bulk
the work after mixing and placed carefully.
1t must not be dropped from a height. 1t
shall be laid in horizontal layers, not ex-
ceeding nine () inches thick, and thoroughly
tar. and until a film of water appears on the
surface. All surfaces upon which concrete is
laid must be wet before deposfting the con-
| crete. Plank or timber forms must be en-
| Moved where necessary to confne the concrete
| to the shape and dimensions shown in the
plans. ,
THE hest 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 1900 pounds per
| square inch, must be used. Every brick must
be wet by immersion before laying and must
| be laid in full mortar Joints on bottom, sides
and ends. not exceeding three-eighths of an
inch thick. All brick work shall be properly
bonded.
The top soil and all vegetable matter shall
| he removed from the area to be covered by
| earth dams. This area shall be cleared, to the
removed therefrom. which is sufficiently free
from vegetable matter, may afterwards be