The Jersey City news. (Jersey City [N.J.]) 1889-1906, 1898-08-04

~hrougho with Rosendale cement con-
crete. surfaced with a layer two inches
thick of Portland cement mortar. Where
the tunnel is In earth or nsoun rock
a brick invert, sixteen inches thick, shall
be laid at the bottom. If It shall be
uesesi ths sin II 1tu Shall II Sc Iaid 't upon a bed
of concrete. Care shall be taken to leave
the interior surface of the tunnel smooth
and free from 6p4 se5Tef1 PoN
If iron castings are used for effluent
pipe, manholes, blow-offs, air-yalves and
other connections, the metal must be re-
melted in a cupola or air furnace, and
must be of pig-iron, without any admlx-
ture of cinder iron or other inferior metal,
Of an even grain, entirely free from IN
combined carbon when seen under the mi
croscope, and such as will bear satisfac-
tory drilling and cutting.
The iron for the castings shall have a
tensile strength of at least seventeen
Thousand pounds to the square men.
Test bars stwenty.six go inches iong,
thick, placed fatwise and horizontal
upon supports t~wenty-four. f24) inches
apart shall bear q steadily increases SS0i
centre load up to nineteen hundred Qy00l
pounds before breaking, and shall exnlpIt
a DETECTION Of not less than fye-six-
teenths Of an inch.
The castings shall be perfectly free from
seoria, sandnoies, air bubbles and other
defects and imperfections.
The castings shah be perfectly cleaned Cd
and no Jumps shall be left on the inner or
on the outer surface.
dressed and made clean and free from
earth, sand and dust, which adheres. to
the iron in the moulds; iron wire brushes,
must be used as well as softer brushes,
to emove the loose dust. No acid or
other liquid shall be used In cleaning the
castings.
All castings. after being perfectly
cleaned, according 70 the speeihcafionSs
he Gilliprfnd fI "a "a rGfui and thorough
hammer inspection.
Every pipe or casting shall be care
pitch and oil. Before the coating Is ap,
piled the casting must be entirely freed
from all rust.
In case the castings cannot be dipped
Immediately after being cleaned, the sur
face must be oiled to preserve It unt1l
it Is ready for dipping; no casting to be
dipped after rust has set in.
The coal tar pitch to be made from
coal tar. distilled until the naptha is en-
tirely renewed and tho material deodor-
lied with a mixture Of 5 to 8 per cent, q
linseed oil. Pitch, which becomes hard
and brittle when cold, will not answer Tor
this use.
Pitch of the proper quality having been
obtained, it must be carefully heated IN
a suitable vessel to a temperature OF 5vV
degrees Fahrenheit. and must be MAIN
tanned at not less than this temperature
during the time Of dipping.
The material will thicken and detefl-
crate after a number of pieces have oeen
dipned: fresh pitch must therefore be FREE
quently added, and occasionally the yes
sci must be entirely emptied OF its oid
contents and refilled with fresh pitch.
Every casting must attain a tempefa-
trrp Of 300 degrees Fahrenheit before be-
ing removed from the vessel of hot pitch.
It may then be slowly removed ana al
lowed to drip.
But no castings shall be dipped until the
INSPECTOR ~pronounces it passed, as 10
r.c rs hr fact PtQE WHen IL I114
Tier. be dipped. The proper coating mast
be tough, and tenacious, when cold on the
castings and not brittle, or with any ten
dency to scale off.
Every length OF east iron pipe shall he
tested to a pressure of 800 pounds per
square inch, and under such pressure the
pine shall be subjected TO a series OF
blows at various points with a three
WROUGHT IRON.
All wrought iron used must be tough,
ductile and hbrous, of uniform quality,
free from crystalline structure, cinde. $,
Jaws or cracks. In bars 1t must have
an ltimat strength of $4,000 pounds per
square inch, with $4,000 pounds elastic
limit, and fan ~elongation of twenty-five
per- cent. in eight inches.
Angle iron must have an ultimate
strength of $4,000 pounds per square inch,
a, COO pounds elastic limit, with twenty per
cent ~elongation in eight Inches.
STONE MASONRY.
Unless otherwise specified, all stone
masonry is to be built of sound. clean
quarry stone, of a quality and size sat
issactory to the Engineer; all joints to he
full of mortar
KIbble stone masonry shall be made
of stone of suitable size, quality and
shape for tho work in hand, and pre-
senting good beds for material Of h
class. Especial care must be taken to
have the beds and joints full of mortar,
and nc grouting or filling OF joints after
the stones are in place will be allowed.
TIE work must be thoroughly bonded.
Where rubble stone masonry is used in
dams the stones must have roughly rec
t~arsgular forms, and all Irregular projec-
lions and feather edges must be ham
mere6 off. Their beds especially must be
good and present even surfaces. When
q stone is lowered on the surface pre-
pared to receive it there must be no doubt
that the mortar will fill all spaces. NO
sp1Wls shall be inserted beneath a stone
so placed, but a moderate quantity may
be used in preparing suitable surfaces
for receiving other stones, II they are
entirely embedded in mortar Various
sizes Of stone must be used and regular
ceursing be avoided In order TO attain
v%eIticaI as well as horizontal bonding.
Spaces Of six inches or more in width be-
tween the stones may be occasionally
filled with concrete carefully rammed.
Masonry which is to receive the shock
OF spillways is to be composed Of large
blocks and is to be especially sound, hard
and compact and Of durable character.
No joint shall be more than one men
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 all beds, builds and joints true to
a depth of not less than three inches,
or more thar four inches from the fao!ngs
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, decreasing grad
ualIy toward the top Of the wall, and ire
width of the bed Of the stretchers IS not
4, be at any point less b twenty-elght
inches. The headers are to be not less
than four feet in length, each course TO
be composed of two stretchers and one
header alternately.
Al, faced Joints shall be raked out to a
depth Of one and one-half inches II
cafefullv pointed with Portland cement
mortar mixed clear.
Granite dimension stone masonry is TO
be used for opingS of dams and Tor the
gate openings in the gate chambers. II
must be made of first class granite, free
from seams and other defects. The stones
shall be cut to exact dimensions and all
fined and sharp. All beds, builds ana
Joints are to be dressed for the fuli 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
applied before its first setting. All joints
to be raked out to a depth OF one ana
one-half inches before pointing.
If Is not intended to compel the use OIL
| quarry stone masonry laid in cement
- 4hA ENarfnanr