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442.072
bed near its middle, a series of outlet-pipes
leading from the said drain to one side of the
road-bed, means for closing the outer ends of
the said outlet-pipes, and branch air-pipes ex-
5 tending transversely from one side of the
road-bed to the said drain, the outer ends of
the said pipes being adapted to connect with
an air-pump for pumping the air out of the
drain, substantially as shown and described.
Io 3. In a system of road-drainage, the combi-
nation, with a drain arranged longitudinally
under the road-bed near its middle, of a
branch air-pipe extending transversely and
connected with the said drain, the outer end
of the said air-pipe being adapted to connect m
with an air-pump to discharge the air from the
drain, substantially as shown and described.
ALEXANDER MII'CIIELL.
\VTitnesses:
WALTER ANDERSON,
JNO. P. SHERIDAN.