693 [=54] (V.2)

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693

gates, or with attached and pro=
=jecting apparatus it would be
fatal. The great object, therefore,
with works of the sort which I
am now describing is to adapt
the sluices gate in such a way
to the openings, that they may
be instantly removed and self
placed in such a position that
they may offer no impedement
whatever to the current. The
gates which I have described,
fall, it will be observed upon
the floorings, and the flood
passes over them. The whole
work is in fact, on the falling
of the gates left perfectly marked
without any further obstruction
to the passage of the water, than
that offered by the piers.-

The protective managements
for covering the foot of the Rivet=
=ments which I have beore des=
=cribed are continued [?] the
upstream flanks of the Dam,
along the face of which is a
similar line of [?], formed
by piling and box work filled
with boulders, the whole mass
being throughly held together by
sleepers ; The [?] which has
been thus described, has a slope
inwards towards the Canal
of 1 1/2 feet, and it is intended
to act not only as a bar to the
interference of the water with
the foundations, but to protect
the wall from the effects of
the current as it sweeps along
at its foot.-

On the downstream side of

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