The Sun.
London, England, 1804-05-14 00:00:00

the. tide ; fortunately a place has been dihuivered
wh-re a f‘undation on cl,y may be got at, by sun
rounding the pit with a c .ff4r.darn.
But in the trials which have been ma,le on other
parts of the line, it has been found generally, that
the gravd and sand his a mixture at earth among
it sufficient to exclude •water, except in a few places,
and one of those places happeris to he where a lock
was intended at the entrance of Lorh Ne,s, near
Fort Augustus the foundation of this lock must
br-I4 feet below the level of the summer surface of
the.lake. As this, in •so open a soil, 'would probably
he impratticable, it will be necessary to cut a new
channel fix. the River through rock on the north
side of it, so as to leave, in or near the present
channel of the River, a foundation of ruck fur the
lock.

It will appear by the estimate, that the principal
articles of extra expence, beyond the common ex-
pences which would have been necessary to form
such a Canal on plain ground, are, the cutting a new
Course for the River Lucky, the damming up the
L.och so as to' raise it rz feet
,above the present
lever, and making a weir for dischargigg its water
into the'kiver Srean ; the' extra ciattiig on the sum-
mit kid, between Loch L ,shy and Loch Oich ;
the deepening of L cli Oich ; the cutting a new
channel for the Rivera! rough rocky ground at Fort
Avastus, acid tji .king a cotirer.d,on ti.ere for inclos-
ing.the L ,ck pit ; the deepening the River below
Bona Ferry, at the east end of Loch N,s, and cut-
ting a new c-urse (witlt a bridge over :I) for dl._
charging the floods of the Lake, .and lessioill the
velocity of the cutrent, through the present channel,
which must be the passage for ; and the coffer
dam, &c. at Inverness ; am ,unting together, with
some other extra work, to about 60,600..

One of the most difficult parts of the Navigation
to make and maintain to a proper depth, wilt tie the
passage from Loch Ness into and thr ,ugh the lithe
Loch at Doughfour, the water from L ,ch Ness (be-
ing probably as !noclias is discharged by t;:e River
Thames_ above the tideway) is confined in a narrow
pass, through which it runs with considerable veloci.
ty, and large quantities of gravel rolling along the
coast from the north side of the L,ke, is carried
through this pass into and throug:i the Loch of
D uglifour ;, it is to remedy this in part, that it has
been proposed to cut a new opening through the
land at the north-east corner .of the L-ch, which
will intercept part of the gravel, and lessen the ve-
locity of the current through the present pass z if
this should not cAnpletely answer the intention, a
pier or jetty may hereafter be projeded in the Loch,
to inteicept the gravel.
In further aid of lessening the current, a weir is
proposed below the Little Loch, to pen it up to the
level of Loch Ness, which, except in great floods,
will have its proper effect ; but as Loch Ness .has
been known to vary in the height of its surface as
much as to feet, the haling of ships against a cur-
rent must-soinctimes be suhmuted to.

As the depth of water in the Canal is proposed
to be 20 feet, the width of the Locks proper for the
largest ships that can navigate on such depth of
warer should be 38 feet, the length of the Locks in
the chamber about 152 feet.
There will be wanted about 23 Locks and as
many Bridges. As stone and good lime can be
procured in the country at a very moderate price,
the Locks will cost something less than I had be.
fore supposed; the fir timber of the country is
small in size, but will ie.: very proper for piling in
the foundations, and for -planks. for wheeling bar..
rows on; and as oak timber would be very expen.
sive, I have computed for making the gates and
platforms, and for other purposes where large tim.
ber wilt be wanted, on using the American pitch
pine, which will be as durable as oak, and much less
expensive.

The Eitimate does not include the purchase of
any land ; much of the land is of little value, and I
have presumed that most of the land-owners will
consider the bgnefit that their properties must de-
rive from the Canal, as a compensation for what
may be cut away.
Neither have I noticed the anchors and mooring
chains for the Locks: the number of them that rndy
be wanted, and the depths, are uncertain ; but I pre-
sume there will be required for this purpose be.
tween four and eight thousand pounds.
There can be no doubt of having an ample supply
of water, and much to spare fur many other valua-
ble purposes.

Having obtained tolerably correfl information of
the value of initerials and workmanship, I have
estimated a Lock, such as before described, to cost
7449. exclusive of digging the foundation and
oat:King it, with earth, which are afterwards includ.
ed in a gross sum.

Hence it appears that 23 Locks will cost - ,C . t 71,327
23 Bridges, some over the Locks and others detached 34,000

[Here Mr. Jvs,op enumerates vari,,us other items
of expencr, amounting, with the preceding, to
474.531i1
(Signed) W. JESSOP.
Newark, Jan. 30, 1804.