The Cadiz sentinel. [volume] (Cadiz, Ohio) 184?-1851, 1850-07-24

SEVEN MtLEs TUNNEL THROUGH THE ALPS
The following details are gathered iom
DR.. Glanville's pnper:--
10 give at once some idea of lIe bodness
OF Chev. Mons undertaking, we may, in the
hrst place, state that in lis progress The tun~
mel must pass under some of the most elesa
ted cresis OF Mont Cenis-one in particular,
where there will be 4 $50 feet on The noun,
tain, capped with eternal glaciers, overheard,
at the middle Of the tunnel, so that not only
1.-The w0rkmeu and machinery in construc.
iion, and the passengers nd trains in transit,
he bur'el TO that depth in the heart Of the
mountain, but all idea of shafts, either Ia ia,
c.luate excavation or TO promote ventilation,
must be out OF the question, Tho breath Of
lille itself mast be respired ON either en-
tremiIy with artificial aid, in shape of cur.
rents Of fresh airtian smiued and Of foul air
withdrawn, by mechanical apparatus everat
wDTk-at least, during excavation which is
also to-be affected by machinery of new
and simple nature, worked by water power
OF mountain streams, whereby The trains are
also to be run through The tunnel, which as,
dane, oil The way to its exit at Bardonneche,
with gradient equal TO l0in 1000. The
. machine, once presented TO the rock, projects
into II simultaneously four horizontal series
Of sixteen scalpe's, working backwards and
forwards; by means Of springs cased in, and
put in motion by the same wafer power
While these are a; work, one vertical series
on each side works simultaneously up aud
down, so that trgether they cut out iour
blockssor rather nsulate -four blocks on all
sides, except on the rock behlud, frum which
they are afterwards detached By hand. l.
has been already ascertalncd that each OF the
Two machines, at the opposite ends Of the
tunnel, will excavate 10 the extent Of % Zee
2 day, and il is estimated That lie whole ex
,cavaton will be completed in four years.
The gallery 10 be perforated by tho machine,
will be IL feet wide by Z high, and this once
cut through, the hote will be ella ged by or
.lnary means to % feet in width aud 10 fee
in heightll, and n double line Of rails laid
The estimated cost Of this great tunnel il
only las04,042f (552,l97). II is 10 b
Immediately commenced at tho north en-
trance. Builder.
TEEru SET ON EDGE, An acid foods
drinks, medicines. and tooth washes ard pow
dels, are very injurious to The teeth. If
tooth Is put in cider, vinegar, lemon juice
OF tartaric acid, in few hours the ename
will be completely destroyed, SO that il car
be removed by the finger nal'as eusilyas
j. were chalk. MUst have experienced wha
is called having the teeth sci on edge. Th
explanation oft is, the acid Of the fruit tina
has been eaien has SO far solled the ename
of the tooth that the least pressure is felt b
the eyceeding small nerves which peryad
the thin meinhFane which connects the enau
81 antl the bony part Of the tooth. Such q
effect cannot be produced wi,bnnt injurin
the enamel. Tfuey il will become bar
ngaia when the acid has been removed b
tho fluids Of The mouth, just ns an egg she
that has been soflencd ID this way become
hard w being pu. Ia the water. When II
effect Of sour fruit upon the teeth subside
they feel as wellHs ever; but they are noti
we'll And the oflonor II Il repea,ed, Ii
sooner will the disastrous consequences
manifested. Family Visitor, n