I and of the different
feet in width and, depths shown in the
Cross Sec-
tion. The stones will be squared
in all their sides and joints and
will be laid in Portland Cement.
e another
mortar, and fastened to one, by wrought iron clamps of the dimens
-sions shown in the Drawing, and
run
with lead. The upper course
which is most liable to
of onavonry which enjury from the shocks of the
the wav
and the bumping of wrecks will be formed of Stones, dovetailed into,
another, and clamped as shown in
The
the plan. The
ones
- foundations will be
protected by large granite boulders
laid along the footings of the wall.
St
It
posed to have either
is not proposed
coping
or
542
- parapet in the new design .
A vertical backing of Portland Cement Concrete three feel thick -
will support the Masonry prom top
ек
to bottom, and
layer of the
the same
two.
。 feet
thick will be spread over
the Prays Roadway
to a width of
ten
8 feet, thus forming/.
impermeable
ard
shell which will save the structure
from being undermined in its pear.
Italice
Surveyor General
15. May. 1875.