TUNNEL UNDER THE THAMES.
{"newspaper_name": "The Wilmingtonian, and Delaware register.", "edition": "01", "page": "p2", "byline": ""}
Considerable progress has been made IN
the digging Of the tunnel under the Thames.
There are to be two archwavs for carti-
ages, and distinct pathways for foot passcn-
gers.-The width of the tunnel is TO he thr-
ty feet, its height twenty, and length one
thousand and two hundred- Each arch"ay
is to have fourteen feet clear width, with
frequently communications from one to the
other. The depth Of the path below the
surface Of the river is seventy seven feet.
The depth of the water in the ship channel
is thirty tour feet, and besides bed of sew
eral feet Of gravel and sand, it is computed
there will be thickness of fifteen feet OF
solid earth between the crown OF the tunnel
and the bed Of the river. A strong arch of
brick work is to be built as fast as the exca-
vltion advances. The clay removed in the
excavation of the tunnel is conveyed to a
neighbours field, and there converted into
bricks, 10 be replaced in their new form, in
the construction of the arch. The entrances
to the tunnel arc to be approached by circu-
lar rdescents of easy declivity, not exceeding
four feet in hundred. The archways arc
to BE constantly lighted with gas. The sit
uation of the tunnel is such that no bridge
could be permitted there on account OF the
obstruction it would afford to the navigation
of the river. The expence is estimated at
4160,0 900, Il much less sum than would be
required forthe erection of bridge. 1t is
expected that il will be finished in three
years.-Loa. PAP.