The Jersey City news. (Jersey City [N.J.]) 1889-1906, 1898-01-22

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fresh pltch must therefore be frequently added,
and occasionally the vessel must Pc ent,rfiS
emptfed Of Its old contents and refilied win
fresh pitch.
800 degrees Fahrenheit before being removed
from the vessel Of hot pitch. ,s
y may then be slowly removed and allowed
But no casting shah be dipped until the n
spector pronounces 1t passed, as to rust, nan
The propes coating must be tough and tena-
cious, when cold on the castings, and not pfit-
'ie Ey 81 WITH Ish any tendency 9ya to ,,, scale ,hs e,i' Re tested
to a pressure Of 800 pounds per square men,
and under such pressure the pipe shall be sub
Jeuled 20 a series Of blows at various ponies
with a three-pound hammer
WROUGHT RON
All wrought iron used must be tough, due
Tile and hbrous, of uniform qualty, Tree lronr
crystalline structure, cinders. flaws or cracks;
In bars 1t must have an ultimate strength % o od
$1,000 pounds per square inch, with 4o,oo9
pounds elastic limit, and an elongation OF TWEEN
ty,ave per cent. in eight inches, ,ah
Angle iron must have an ultimate strength
OF $4,000 pounds per square inch, 24.ooo POUNDS
elastic limit, with twenty per cent, elongation
STONE
Unless otherwise specified. all stone masonry
is to be built Of sound, clean quarry stone, Of
q quality and size satisfactory TO the Ell
gineer; all points to be full of mortar.
Bubble stone masonry shall be made OF
the work in hand, and presenting good beds
Tor material Of that class Especial eate
full of mortar, and no grouting or filing Of
joints after the stones are in place Will pc
allowed. The work must be thoroughly pond
Where rubble stone masonry is used in dams
the stones must have roughly rectansular
forms, and all irregular projections and feather
edges must be hammered OFF. Their beds es-
peeiaiiy must be good and present even sur
faces. When a stone is lowered on the sur
race prepared to receive it there must be no
doubt that the mortar will fill all spaces NO
spawis shall be inserted beneath a stone
SO placed. but a moderate quantity may be
used in preparing suitable surfaces for re-
ceiving other stones, If they are entirely en-
must be used and regular coursIngs be avoid
ed in order to attain vertical as well as hori-
zontal bonding. Spaces of six inches or more
IN width between the stones may be ecca-
sionally filled with concrete carefully rammeds;
masonry Which is to receive the shock OF
water and ice, such, as on the aprons or spill
ways, is to be composed of large blocks and
and of a durable character. No joint shall be
more than one inch wide. The exposed faces
pc equal IN appearance and quality 70 tnat
OF the Macopin intake dam of the Newark
have all beds, builds and joints true to a
depth of not less than three inches, or more
tnan four inches fropa the faeings, 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-
ereasing 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 not 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.
< Granlte dimension stone masonry is to be
used for copings of dams and for the gate
openings Ia the gate-chambers- It must be
and other defects The stones shall be cut
70 exact dimensions and all angles, and
All beds. builds and joints are to be dressed
for the full depth Of the stone to surfaces,
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 q depth Of one aud one-half inches be-
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
Inc 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
| tons shall be used as in the opinion of the
Engineer viii produce mortar conforming to
| 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 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
| produce a mortar Of the above strength.
Mortars used in the brick lining of tunnels,
the walls Of g~ate-chambers. in dimension
stone masonry or concrete in unusually expos
ed situations shall show a tensile strength of
at least 100 pounds per square inch of section
4 O the nn6 nf Enpa uyAaE IN nnI1rdo a n,1or
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 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
No mortar shall be mixed in advance of its
immediate use, and none shall be used which
has begun to set.
Cement and sand shall be thoroughly mixed
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
wet with water and then thoroughly mixed
with the mortar in such proportions and man
ner! that all surfaces are covered and all VoidS
| filled 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.
| Concrete must be Immediately deposited in
the work after mixing and placed carefully.
| II must not be dropped from a height. 1t
shall be laid in horizontal layers, not ex-
eeeding nine () 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-
| nloved where necessary to confine the concrete
to the shape and dimensions shown in the,
| plans. - o,
The best quality of whole, new brick, burn
4 ed hard entirely through, free from injurious
| cracks, and with even, true and smooth faces,
| square inch, must be used. Every brick must
he wet by immersion before laying and must
/ he laid in full mortar joints on bottom, sides
/ and ends. not exceeding three-eighths of an
bonded. .
L The top soil and all vegetable matter shall
he removed from the area to be covered by
satisfaetion 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
shau extend the entire length of the dam and
from the high water level down into the mate
| rial underlying the em~bankment to- sound rock
or Some other impervious material.
The earth used in the embankment shall be
carefully selected of the best materials, mix
| I'll If necessary, to secure imperviousness to
uSater The earth shall be spread upon the
Enhancement in level layers, not exceeding six
| inches in thickness, and narrowed, wet down
Tha slanes of entertainments shall not be