atmospheric Railway.
{"newspaper_name": "Richmond palladium.", "edition": "01", "page": "p2", "byline": ""}
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A correspondent of the Boston Advertiser gives
description of the Atmospheric Railway, Of
which much has been said and which he saw
in operation Kingston, the artificial ha rbor of
Dublin. the only road on which this invention
has vet been put IN operation, though 1t Is said
that it is be applied to other md moro OK
tended routes. The construc ton Of the road is
like that of the common Railroad. only so far
the track and passengers concerned. Mid
way between tho rails is lrnbedded. TO three quar-
tors of lis diameter, cast iron cylinder of ID
more inches caibrc; this is put together in ioints
and FIRMLY secured TO tho Shoppers on which
the rails At each end of tho route is bull
ding covering small high pressure steam engine
giving motion TO large air pump. which exhausts
tho air from the whole tube. Directly on the
upper surface OF the tube, and running It's whole
length. Is n slit about inch wide, covered on
tho outside by flap of sole leather four inches
vide, screwed on side TO tho tube and free
on tho other. A small ridge in the cast iron of
the tubo allows composition of tallow and bees
wax. to be melted over the crack by ho, iron.
thus closing it moro etfociually.


The piston is made, Of course, TO fit perfectly
tho inside of the tube. A. each end Of tho route
is a valve opening into the tube. The piston is
connected with the car above. by a strong rod,
which passes out at the slit in the upper surface
of the tube. OF course if the piston moves, the
car must move with It.


Suppose the car, then. at one extremity, to be
sta rted for the other. A signal, BY the magnetic
telegraph, notifies the steam engine a, the other
end, by which the air pump is SC, in motion and
the air within the tube Is pumped out, The air
at the other end attempts. of course, to rush in;
but the valve being closed, It's whole force, equiv.
acnt of course TO pressure of fifteen pounds to
the square inch. is exerted upon the piston, which
must necessarily be driven towards the farther
extremity of the tube; and the car at the same
time is borne along. To prevent the air rushing


in through the Slit which IS opened by the passage
through it of the connecting bar, the piston is
placed several feet in advance of that bar. SO
that the tube Is never opened over tho exhausted
portion, but directly behind The piston small