The southerner., 1853-11-19
Plan OF THE PnoposEp Works.

IL |
The Dimensions of the locks between
the main sills will be 1l2 feet, with the
exception of the first lock calculated for
larger boats, which will be $50 feet be-
tween the main sills. The width of the
lock-chambcrs will be 25 feet; the tatt
ban will extend 20 feet below the lower
main sill; the fore bag will extend
feet above the upper recess. The total
length of the lock walls, with the excep-
ton of the first lock, will be 157 feet
those of the first lock will be l75 feet.
The width of the lock walls will be 10
feet.
The foundations will be formed by
driving piles feet apart, in rows
across the space to be occupied by the
lock, The piles to penetrate the sub
stratum-thosc piles will be sawed off to
the proper level-they will be connect
ed together with II II timbers bolted
to their heads, upon these timbers there
will be three courses oe 2 inch plank
battoning one upon the other, secured
by trunails and 6 inch spikes; the two
last courses will be jointed. The upper
course of plsnking will constitute the
bottom of the lock-chamber, and the
foundation for the mitre sills aud side
walls. There will be four rows of short
piling, 2 inches thick, driven across the
foundation into the substra tum of the
river, and a suitable pudding placed
above each row to prevent any under
current through the foundation; one
row at the head Of the lock; one at the
tail, and one under each nitro sill. The
sand will be excavated to the substra-
tum for the extent of the pudding. The
outside of tho foundation will be sheet
piled with 4 inch plank tongued and
groovcd, and we'll secured to the timber5
upon which the planking of the lock
bottom rests. The entire space between
the piles will be filled with such mate
rial as may be approved, up to level
with the top Of the tlmbers connecting
tue heads OF the pies.
The lock ,calls will be Is s inches
high and Is feet thick: they will be
formed by courses of range timbers con-
nccted by ties every 10 feet; the tim
bors to be II II inches and secured
to the ties by dove tailed joints and tru-
nails. The cribs thus formed will be
filed with suitable packing, if it can be
found in a natural state; if not, strong
fAcincs VIII be constructed of suitable
dimensions filed with material of sufG-
q mt specific gravity, and the crib walls
packed with these in layers. These ia
cinccs are simply cylindrical hurdles,
formed by a strong mating upon up
right sticks Of | inch diameter, with
heads to At. They arc extensively used
in fortifcations, and all works of art
whore stone cannot be had. The inner
sides of the lock walls will be lined with
two courses of sheeting; the first course
of inch plAnk, and the second course
of inch plank, Each course to be
jointcd so as to secure water tight lock
chambers. There will be one course of
, inch sheeting secured upon the out
side of the lock walls, and coping course
on the top. The timbers will be RABBIT
ted to receive the ends of the plank,
and secure a strong and workmanlike
finish. The plankiug will be secured
by spikes and stout nails, in such num-
bers as will be designated. The recess
es will be Is inches deep and lined in
the same way as the lock chamber. The
miter sills, hollow quoins and lock gates
will be formed out of such timber as
may be approved, and in accordance
with plans and drawings to be furnish
ed. There will be pier-head extend |
ing up the river, in line with the pro-
longatiou of the inner side of the outer
lock wall, to form safe bay for boats
in entering and passing out ofthc locks.
Remainder IN our nert.)