Morning herald. [volume] (New York [N.Y.]) 1837-1840, 1839-07-18

eight inches in the part parallel with the chord o.
the inverted arch and two isst IN me par. parallel
to the chord Of the roofing arch, whence the span
| drel backing runs of to point.
In earth tunnels, the entire masonry is brick; the
thickness Of the inverted arch is eight inches and
that of the sides and roofing arch twelve nches and
in entirely open cut the conduit has roofing arch
Of eight inches thick In all rock tunnels the con-
duits are made similar to those above described
except that there roofing arch; but the conduit
is made water tight above the height of the watering
in the earth tunnels Along the entire line there will
be teentunnels through the rocky hills, varying In
length from hundred and fifty to nine hundred feet
The aqueduct is carried across ravInes by means OIL
entertainments in which there capacious culverts
to admit the passage Of streams OF running water,
brooks &C.; there is also strong foundation wall,
built up from the bottom Of the ravne t. the aque-
duct, little wider than the sectional area OF the con-
dnit, and projecting proportonaely from the top to
the bottom. On the outside of the embankment Is q
massive protection wall, which is dry laid. Over
turnpike roads there are thrown beautiful viaduct
bridges all constructed with the strictest regard to
strength and durability; the most handsome one Of
this kind is on section %, (Appleton's) where the
President cheered last Friday, the lettering on
which was finished only yesterday. Across water
courses such creeks and the larger streams there
are thrown beautiful aqueduct bridges, the most i'm
posing one Of which can be seen at section 20 Mr..
Youngs) in the village Of Sing Sing. This bridge is
formed of one magnificent stone arch, thrown over
the Sing Sing Kill, which has span OF eighty eight
feet versed sine of thirty feet and which Is
eighty feet from the foundation to the crown Of the
ARCH 1t is believed to be the largest arch OF the
kind in America. The foundation of the abutments
of this arch is solid rock, worked to perfect sur
face. The of the arch is an elpsis The stone
at the spring is feet in the bed, and IL inches thick
the ntredos, diminishing to the crown to feet bed
and ID inches thick. The whole face of the works
including the arch bevels inch to the foot, which
makes the ring stone very difficult TO fit. The ring
stone is of granite from the Hudson River Highland
the greater portion of the other stone work gneiss
whau lofaA will have
the average weight of each course to be from 10 to
IL tons 80 already laid, and the calcula-
ton is to have the keystone in by the 10th OF next
month The centre used in constructing this arch Is
on a new principles it consists of three principal
braces constructed to radiate from point at
the base Of the arch, and terminate in continuous
line at the first and second points Of bearing and at
the Of the arch and thus sustain all the pres
sure On this same section there is also tunnel
335 feet long cut through solid rock, the sides lin
ed with brick, and the rock forming the roofing arch
These points of the work which, with the great
dam, and the viaduct arches across the ravlne at
Sleepy Hollow claws section), and some impor-
tant points on Mr.. CarmichatPs sections should
be visited by all who devote day or two to
the pleasing task set OF bridges Will also be con-
structed on Manhattan Island, that will be highly
interesting, from the fact that they will cross eight
or ten streets in the upper part Of the city
Such is a general outline Of this magnificent I'M
dertaking which have travelled along the entire
line Of from the dam to the spot appointed for the
distributing rvoir al Murray Hill The work is
most admirably performed all along the route thus
far and most particularly the sections undertaken
by Mr. Carmichael. Mr.. Young, Mr.. Appleton Mr.
Farrell, and two three others. Up to the first OF
January last, the commissioners expended Sl963,-
3S5 IL they have expended up to the present time
about S4,5OO,000 The excavations in earth and
rock and the brick and stone masonry, are paid for
by the cubic yard the dry walls and foundation
walls paid for in the same way the lumber il
paid for by the thousand and the cast and wrought
iron by the pound. Upon the entire line In Deceln
Der last, there were only 1889 men employed; but
as the number averages nearly 30 on every one
II the &c sections, Except the brdge) there must
be 900 men employed. The first payments
were made in July, 1885, and for three years only
$3.50 600 were expended In the 7th half year end
ing January 1, 1882 there S.sSi, 900 expended
and this last half year ending July LIST, lS39 there
has been about 81. 00) 900 expended. The work has
been under way Just four ears and there has been
$4,000 900 disbursed Of this all the engineers have
had only $50 000 the printers have had much less
than So coo, and the fat sleek headed, seepo night
commissioners have pocketed about $50 900 in sala-
ries, dinners rides, incden'als, ct ceteras humbug
ct ceteras, tomoolery, ct ceteras, ct ceteras, ct
ceieras "A great deal of sack a very little bread
Now comes the ever recurring question, When
will this great work be finished, aud how far has IL
in detail 7" On the LIST Of January last
IA Of fha