The Jersey City news. (Jersey City [N.J.]) 1889-1906, 1898-01-19

less than this temperature. during the time q
dipping.
The material will thicken and deteriorate
after a number of pieces have been dipped'
fresh pitch must therefore be frequently added,
and occasionally the vessel must be entlrety
fresh pitch.
800 degrees Fahrenheit before being removed
from the vessel OF hot pitch.
IL may then be slowly removed and alioweu
But no casing shall be dipped until the In
spector pronounces 1t passed, as to rust, nam
mer test. ETC.. when it may then be dipped.
The proper coating must be tough and tena-
cions, when cold on the castings, and not prit-
tie or with any tendency to scale on, .as.aa
Every length of cast iron pipe Shall be tested
to a pressure of 800 pounds per square men
and under such pressure the pipe shall be SUP .
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 hbrous, OF uniform quality, free from
In bars It must have an ultimate strength or
., ooo pounds per square inch, with Zv,yr
ty-ive per cent. In eight inches. :,
AEgle iron must have an ultimate strengsn
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.
Bubble stone masonry snail be made OF
stone of suitable size. quality and shape TOT
the work in hand, and presenting good oeas
Tor material of that class. Especial care
must be taken to have the beds and JOINTS
fun OF mortar, and no grouting or fining OF
joints after the stones are in place Will pc
allowed. The work must be thoroughly bond
ed.
Where rubble stone masonry is used in dams
forms, and all irregular projections and featner
edges must be off. Their beds es-
pecially must be good and present even sur
faces. When a stone is lowered on the SUI
face prepared to receive it there must be no
doubt that the mortar win FIJI all spaces. NO
spaWls shall be inserted beneath a stone
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 be avoid
ed IN order to attain vertical as well as nori-
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 OF
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
have al 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 o~ne-ialf 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,
ard 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,l each course to be COM
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
used for copings of dams and for the gate
openings in the gate-chambers. 1t must be
made of hrSt-claSS granite, free from seams
and other defects. The stones shall be cut
to exact dimensions and all angles and
ARISES shall be true, well defined and sharp.
All beds. builds and joints are to be dressed
for the full depth of the stone to surfaces,
The stone shall be laid with quarterback joints,
and all face joints shall be pointed with NOR
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.
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
ae.ern1ne wnesner the mortar SO made con
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-walls of earth
dams, in the foundation and main body Of
tunnels, etc, shall show a tensile strength OF
at least twenty-five pounds per square inch
or section at the end or one week, nifty 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, OF
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
stone masonry or concrete in unusually expos
ed situations shall show a tensile strength OF
at the end of one week, $50 pounds per square
inch at the end of one month, and $50 pounds
posed of one part Portland cement to two
parts of sand, or such other ingredients OF
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
the time in water, a tensile strength of al
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
Cement and sand shall be thoroughly mixed
dry, by repeated turns and until the mass
has become homogeneous and of uniform
color. A proper proportion of water shall ther
be added and the whole quickly mixed.
CONCRETE.
The stone shall be broken so that the greater
diameter shall not exceed three inches. II
shall be sound and clean. The stone shall be
wet with water and then thoroughly mixed
with the mortar in such proportions and man
ner that all 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
ured in bulk.
Concrete must be Immediately deposited in
the work after mixing and placed carefully
II must not be dropped from a height. II
shall be laid in horizontal layers, not ex-
ceeding nine () inches thick, and thoroughly
rammed until the stone is covered with NOR,
far 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-
nloyed where necessary to %confine the concrete
to the shape and dimensions shown in the
plans. nn1c1 uropu
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 1000 pounds pei
sn,,are inch, must be used. Every brick mus
he wet bv immersion before laying and mus
be laid in full mortar. joints on bottom, sides
incb thick. All brick work shall be properly
ponueo' EARTH DAMS.
The top soil and all vegetable matter shall
he removed from the area 70 be covered BY
earth dams. This area shall be cleared, to the
satisfaction of the Engineer, and the materia
removed therefrom, which is sufficiently free
used for building the outer toe of the dam.
4 concrete core-wall of a proper thickness:
shall extend the entire length OF he dam ant
risi underlying the embankment to sound rocl
or some other impervious material.
M selected of the best materials, mix,
al If necessary, to secure mperviousness t.
water. The earth shall be spread upon tn