The Jersey City news. (Jersey City [N.J.]) 1889-1906, 1898-01-10

distilled until The naptha Is entirely removed
and the material deoderized With a mixture OF
5 10 q per cent. ii Iinseed oil. pitch, which
becomes hard and brittle when cold, Will not
Pitch OF the proper quality having been OBJ
tanned, 1t must ne carefully heated II a SUIT
able vessel to a Temperature OF 300 degrees
Fahrenheit. and must be maintained At nos
dipping.
after a number Of pieces nave been dipped;
fresh pitch must therefore be frequently added,
and occasionally the vessel must be enurSay
eHptied OF It's old contents and rehiied with
fresh pitch.
Every casting must attain a temperature Of
800 degrees Fahrenheit before being removed
from the vessel of hot pitch.
It may then be sl3wly removed and allowed
But no casting shall be dipped until the In
speetor pronounces 1t passed. as 10 rust, nam
n ne test, etc, when II may then be dippea.
cious, when cold on the castings, and not prlt-
tie. or with any tendency TO scale of.
Every length of cast iron pipe shall be tested
to a pressure Of 800 pounds per square men
aad anaer such pressure the pipe shall De ns Snps
Jected to a series OF blows at various points
with a three-pound hammer.
WROUGHT RON
All WrouSh. iron used must be tough. que
tile and fbr9us, OF uniform quality, free IRON
crystalline structure. cinders, flaws or cracks
n bars It must have an ultimate strength q
o,ooo pounds per square inch, with 2o,oo'
pounds elastic limit, and an elongation OF TWEEN
ty-five per cent. in eight inches.
Angle iron must have an ultimate strength
Of $4,000 pounds per square inch, 24,ooo pounds
elastic limit, with twenty per cent. eiongation
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.
hubble stone masonry shall be made OF
stone or suitable size, quality and shape tor
for material D Of that ahp class lss'i Especial siai care
must be taken to have the beds and joints
full of mortar, and no g%routing Or filling OF 7
joints after the stones are in place VIII De
allowed. The work must be thoroughly BOND
ed.
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-
peciaily must be good and present even sur
faces. When a stone is lowered on the sur
face prepared to receive it there must be no
doubt that 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 re-
ceiVing other stones, II they are entirely en-
bedced in mortar. Various sizes OF stone
must be used and regular coursings be 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 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
= 0ShA,h' Stiia
be equal IN 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
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-
creaslng 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
Tour ISet In length each aDllrSe 70 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
used for copings of dams and for the gate
openings in the gate-chambers. 1t 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, well defined 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-ineh 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
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
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
lions shall be used as in the opinion of the
engineer viii 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
masonry dams, in the concrete backing 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.
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
at the end of six months and may be com
posed of one part Portland cement to two
parts of sand, or such others 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 incn of section.
H. III FtcStCuA III OdhCo Oil CliCll sid DC
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 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
ner that all surfaces are covered and all voids
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
1t must not be dropped from a height. 1t
| shall be laid in horizontal layers, not ex-
| ceeding nine (9) inches thick, and thoroughly
| rammed until the stone is covered with NOR
| 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 contine the concrete
plans. - n
The best quality of whole, new brick, burn
! ed hard entirely through, free from injurious
with a crushing strength of 1900 pounds per
square inch, must be used. Every brick must
he 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 ton 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