The Jersey City news. (Jersey City [N.J.]) 1889-1906, 1897-10-30

square inch, and under such pressure the
pipe shall be subjected to a series OF
blows at various points with a three
pound hammer.
WROUGHT IRON.
All wrought iron used must be tough,
ductile and ibrous, of inform quality,
flaws or cracks. In bars it must have
an ultimate strength of $1,000 pounds per
square inch, with $4,000 pounds elastic
limit, and an e~longation of twenty-five
per cent. in eight inches.
Angle iron must have an ultimate
strength of $4,000 pounds per square inch,
24,0o0 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
isfactory to the Engineer; all joints to he
Hubble stone masonry shall be made
of stone of suitable size, quality and
septing good bed for material of that
class. Especial care must be taken to
have the beds and joints full of mortar,
and no grouting or filing Of joints after
the stones are in place will be lowed
The work must be thoroughly bonded.
Where rubble stone masonry is used in
dams the stones must have rec
angula forms. and all irregular proJec-
lions and feather edges must be ham
mered off. Their beds especially must be
good and present even surfaces When
Il StDIlt is lowered OIL the ul1dC PAC-
pared to receive it there must be no doubt
that the mortar will Hi all spaces. No
spawls shall be inserted beneath a stone
so placed, but a moderate quantity may
be used in preparing suitable surfaces
for receiving other stones, IL they are
entirely embedded in mortar Various
sizes of stone must be used and regular
coursingS 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
filed with concrete carefully rammed
Masonry which is TO receive the shocE
of water and Ice, such as on the aprons
Of spillways, is to be composed OF iarge
blocks and is to be especially, sound, hard
and compact and of a durable character.
No joint shall be more than one men
wide. The exposed faces of all masonry
dams and gate-chambers shall be equal
iii appearance and quality to that OF the
Macopin intake dam of the Newark water
works. The facing stone masonry snail
have all beds, builds and joints true 10
a depth of not less than three lncnes, OF
more than four inches from the faclngs.
and The joints shall not exceed one-halr
inch in width. The rise of the courses
may vary from bottom 10 top from thirty
inches 10 fifteen inches, decreasing grad
ually toward the top of the wall ana
the width of the bed of the ~stretehers
is not 10 be at any point less than TWEEN
weight inches. The headers are to pc
not less than fourSfeet in length, each
and one header alternately.
All face Joints shall be raked out to a
depth of one and one-haiI lncnes ana
| course TO be composed of two ~stretchers
carefully pointed with Portland cement
mortar mixed clear
Granite dimension stone masonry is to
be used for copings of dams and Tor the
gate openings in the gate-ehambers. II
must be made of tirst-class granite, Tree
from seams and other defects. The stones
shall be cut TO exact dimensions anu an
| angles and arrtrss shall be true. Well de-
fined and sharp. All beds, builds ana
Joints are TO be dressed for the full depth
of the stone to surfaces. flowing OF one
quarter inch joint at most. me 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
| 10 be raked out to a depth OF one ana
one-haif inches before pointing.
1t is not intended to compel the use OF
| quarry stone masonry laid N cemenI
where dry stone masonry IS suinclent, Ii
The Judgment of the Engineer.
MORTAR.
The contractor shall submit samples or
the ingredients and the proportions there
| If TO be used in mixing mortar for the
| work. to the Engineer, a suff1elent time
| in advance of their use, TO permit OF SUIT
! able tests being made to deternlne
| whether the mortar SO made conforms 70
the specifications. II, for any cause, tna
| Engineer finds it impossible to make such
| tests. then only such ingredients and pro-
! horizons shall be used as in the opinion
| Of the Engineer will produce mortar cons
| forming TO the speclhcations.
All sand used shall be clean and sharp
free from pebbles.
| earth dams. in the foundation and main
body of masonry dams, an the concrete
backing OF tunnels, ETC., shall snow d
| tensile strength of at least tWenty-HVe
| hounds 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 eng
| of six months, and may be composed OF
| one part Rosendale cement ana two parts
| sand, or such other ingredients or pro
portions as will produce a mortar OF lns
| above strength.
Mortars used in the brick lining of tun-
! nels, the walls of gate-chambers, IN IL
mension stone masonry or concrete IN un-
usually exposed situations snail snow d
| tensile strength of at least 100 pounds per
| SQUARE inch of section at the END OIL one
| week, $50 pounds per square men at tne
end of one month. and 2O pounds at inc
end of six months n may pc COM
| posed Of one part Portland cement to Two
| parts of sand, or such other ingredients
or proportions as will produce a mortar
of the above strength.
posed of neat Portland cement, moder-
ately slow setting. and shall snow n one
week, after setting two hours IN ar an
tensile strength OF at least 55V pouhuS per
SQUARE inch of section.
When tested in cakes all cement SHAH
be free from cracking at the edges
No mortar shall be mixed IN advance OF
lis immediate use, and none shall be used
| which has begun to set.
Garment and sand shall be Thoroughly
| mixed dry. BY repeated. turns n until
the mass has become homogeneous and
Of uniform color. A proper proportion OF
water shall then be added and tine sWneie
qp'eN's CONCRETE. II
The stone snail! be broken so that the
greater iamete shall not exceed three
| inches, II shall lie sound and clean. The
Stone shall be wet with water and then
tboroughly mixed with the mortar IN
such proportions and manner that all
with mortar, bur not more than three
| narts of stone snail be added to one part
~ mortar. All material must be actually
measured in bulk.
Concrete must be Immediately Deposit
cd in the work after mixing ana placed
carefully. 1t must not be dropped from a
| height. 1t shall be laid in horizontal lay
ers. not exceeding nine e(9 inches thlck,
and thoroughly anime until the stone IS
covered with mortar. and until a film of
wafer appears ON ~thsasnfface. sAH sur
faces upon which cUnerete1is laid must
be-. wet before depositing the concrete.
plank or timber forms must be employed
where necessary to confine the concrete
to the shape and dimensions shown IN the
plans
The best quality of whole, new brick.
burned hard entirely through, free IRON
Injurious cracks, and with even. true and
smooth faces. with a crushing strength
Of 1 900 pounds per square inch, must be
used. Every brick must he wet BY ina-
mersion before laying and must be laid
in full mortar Johnston bottom sides ana
ends. not exceeding three-elShIhs or an
s,s 4G;.h An hrirlx work shall he DrOp-