Morning herald. [volume] (New York [N.Y.]) 1837-1840, 1839-08-13

vas Of rock roofing and Iron pipes) or brick aque-
ocst ior " miles, in AZ straight ine as the nature
OF the ground will allow And we believe that there
Never was, even in the palmiest days Of Roman splen
der, larger aqsedact constructed or one carried
greater distance, considering the stratness Of its
course. 1t is true that modern writers, pretending
to quote from ancient authors speak Of Roman aque
ducts 100 miles in extent; bat have no authentic
account Of any aqucduct Of that great length,
have any ruins OF the same ever been discovered.
The highest and most gigantic aqseducts have been
OF but few miles In length and the largest line OF
aqueduct mentioned by Frontinus, is that where he
says that Quintus Marcus brought water in noble
aqueduct to Rome, from spring 81 miles distance
BY the aqusduct but not that distance in straight
line from the city. This aqueduct is still to be
IN ruins through the Campagna around Rome, and
there is every reason to believe that the spring
III the hills that surround the ancient Lago Vucano,
"A distance OF nearly 20 miles.
Our modern American aqueduct, the reiore, we are
bsand to consider the longest in the world, and in
that particular takes precedence Of all Others. Ii
will not be so high in any place the squednct OF
Caserta, Of Spoeto, Nlaintenon, some others
OF ancient date; but If the measurement be correct
Of that magnificent aqueduct of Segovia, in old Cas-
tile then will our aqsednct bridge Harlem river
ian exact picture Of which give above) exceed
that noble work in height FOR the arches Of the Har
lem bridge to be 100 feet above the surface Of he
water. whilst the extreme height Of the double row
OF arches. Gone over the other at Segova ~ bat l2
feet; the extreme height of the work at Harlem
aqueduct bridge being over 100 foet. In the above
representation there ID arches; eight OF these
VIII elshty lecI span, ana seven OF
The extreme length of this bridge Is TO be about
100 feet; and the cxtrewe width over all the top
% feet. fhe piers Of the arches IL feet wide at
the spring line of the arch, battering downwards
quarter Of inch foot the smaller arches
be bat seven feet al the spring liae. The curve of
the arches IN the above picture, at first sight appear
tn partake Of the parbola form, but this caused by
the attempt to show the bridge mnch in perspcc-
tive possible; as the arches are To be- perfectly
semi circular, like those of the great Roman aque-
duct ut the Bridge oil Gard, in the south Of France,
drawing of which we shall give in a few days.
One word more, as TO the manner IN which the
water is carried across the above bridge, and we
have done with the subject for today. Two large
iron pipes OF three feet IN diameter receive the
ter from appropriate chamber into which the
aqueduct proper dsgorges itself az the gate house.
u-t throsgh the treas The bridge AZ the left
Of the above picture These pipes are laid in firm
bed the arches and then securely covered with
dirt the top Of which foot path will be formed
for persons to walk over, although no vehicle or
horses will be allowed 10 pass across the bridge
These three feet pipes il is believed will be sufii-
cient 10 supply the wants ct the city for the
next fifty years after which they to be replaced
by fonr feet pipes In order that a idea may
be formed Of the size of the above bridge. .ure
Of fishing - introduced, as sitting on the rock
the left ofthe picture Such, then, u the nobes
work of modern times in the old w-rld-the
CRoToS AaUEpUcT BRipeE OVER HARLEM RryEH.