The Jersey City news., 1898-07-30


mel IS in rock. If the bottom consists of
sound and solid rock, it may be leyeied
Up and smoothed ana made un1dGfm
throughout with Rosendale cement con-
s crete, surfaced with layer TWO inches
thick OF Portland cement mortar. Where
the tunnel is Ia earth or unsound rock
a brick invert, sixteen inches thick, shall
be laid at the bottom If it shall be
necessary, in order to secure firm founda-
ton, the invert shall be laid upon a bed
of concrete Care shall be taken TO leave
the interior surface Of the tunnel smooth
and free from e94 p9zegJFe5IiR9aaSN, gg IRaN
If iron castings are used for effluent
pipe, manholes, blow-offs, air-valves and
q other connections, the metal must be re-
must be of pig-iron, without any admix
ture of cinder iron or other inferior metal,
and shah be OF a strong, tough character,
OF an even grain, entirely free from un-
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
tensile strength of at least seventeen
Thousand pounds to the square inch.
two (2) inches wide and one q inch
thick, placed hatwise and horizontal,
upon supports twenty7four ca inches
apart shall bear steadily increased seq
centre load up to nineteen hundred 1900)
pounds before breaking, and shall exhibit
a DETECTION Of not less than hve-six-
teenths of an inch.
The castings shall be perfectly free from
scorfa, sandholes, air bubbles and other
defects and imperfeetiens
The castings shall be perfectly cleanea
and no Jumps shall be left on the inner or
on the outer surface
Every casting must be thoroughly
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 remove the loose dust. No acid or
other liquid shal be used in cleaning the
castings
All castings. after being perfectly
cleaned. according to the specifications
and the directions of the Engineer, shail
be subjected to careful and thorough
Every pipe or casting shall be care
fully coated inside and out with coal tar
pied 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 until
1t 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 removed and the material deodor-
lied with mixture OF to per cent, q
lirtseed oil. Pitch, which becomes hard
and brittle when cold. will not answer for
this use.
Pitch Of the proper quality having been
obtained it must be carefully heated n
a suitable vessel to q temperature of 30U
degrees Fahrenheit and must be main
tanned at not less than this temperature
! during the time of dipping
The material will thicken and deteri-
orale after a number of pieces have been
dipped: fresh pitch must therefore be ffS-
quently added, and occasionally the yes
| sci must be entirely emptied Of its Old
| contents and refifled with fresh pitch.
Every casting must attain tempera-
turc Of. 800 degrees Fahrenheit before be-
ing removed from the vessel Of hot pltch
II may then be slowly removed and al
| lowed to drip.
But no castings shall be dipped untilthe
Inspector Dronounces 1t passed, as 10
rust hammer test, ETC., when 1t may
, tlen be dipped. The proper coating mast
be tougl, and tenacious, when cold on the
castings and not brittle. or with any ten
dency to scale off.
Every length of cast iron pipe shall be
tested to a pressure of 300 pounds per
square inch, and under such pressure the
pipe shall be subjected to a series Of
blows at various points with three
tS''l'' WROUGHT IRON.
All wrought iron used must be tough,
ductile and fbrous, OF uniform quality,
free from crystalline structure cinde. 5.
an ultimate strength of $4,000 pounds per
square inch, with 26000 pounds elastic
limit and an elongation Of twenty-five
PEI cent. in eight inches.
Argle iron must have an ultimate
strength of 49, pounds per square inch,
"a. Coz pounds elastic limit, with twenty per
cent. eiongaation Ia ! eight l1lt inches
Unless otherwise specified, all stone
masonry is to be built of sound, clean
quarry stone, Of quality and size sat
issaetcry to the Engineer; all joints to he
full OF mortar.
Hubble stone masonry shall be made
of stone of suitable size, quality and
shape for the work in hand, and pre-
serting good beds for material of that
class Especial care must be taken to
have the beds ana joints full of mortar,
and ne grouting or filling of joints after
the stones are in place viii be allowed.
I'M tc.t hot fhr
Where rubble stone masonry IS used in
dams the stones must have roughly rec
| tangular forms, and all irregular projec-
. tons and feather edges must be ham
merec off Their beds especially must be
good and present even surfaces. When
a stone is lowered on the surface pre-
pared to receive it there must be no DOUBT
that the mortar will fill all spaces. No
wis shsl be inserted beneath stone
so placed. but a moderate quantity may
be used in preparing suitable surfaces
for receiving other stones, If they are
| entirely embedded in mortar Various
| sizes Of stone must be used and regular
ceursing be avoided in order to attain
vertical as well as horizontal bonding.
Spaces of six inches or more IN width be
| tween the stones may be occasionally
filled with concrete carefully rammeds
Masonry which is to receive the shock
| of water and ice, such as on the aprons
Of spillways is to be composed of large
blocks and is to be especially sound, hard
} and compact and of durable character
No Joint snail be more imam 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 mole than four inches from the facings
and the joints shall not exceed one-half
inch in width. The rise of the courjes
! may vary from bottom to top from thirty
inches to fifteen inches, decreasing grad
ually 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-elght It
inches The headers are to be not less
than four feet in length, each course 10
be composed of two stretchefs and one
header alternately
AL. faced joints shall be raked out to 8
depth of one and one-han inches and
| car efBlly pointed with Portland cement
mortar mixed clear
Granite dimension stone masonry Is to
be useG for copings of dams and for the
erste oneriines ia the gate chambers It
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 arrises shall be true, well de-
fined 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 inch joints,
and all face joints shall be pointed with
mortar made of clear Portland cement,
applied before its first setting All joints
to be raked cut to a depth OF one and
! one-half inches before pointing