Evening star. [volume] (Washington, D.C.) 1854-1972, 1907-06-30
CONTRACT FOR DREDGE
WORK OF CLEANSING DALEcAR.
LA RESERVOIR.

The contract for the construction of a
ten-inch hydraulic dredge for use in the
cleansing Of the Dalecarlia reservoir has
been awarded by Capt. Spencer Crosby,
United States engineer in charge of the
public works in the District of Columbia
to whitehall Bros. OF Chester, Pa, and II
Is understood that work on the dredging
plant will be started In a short time and
that the machine will be delivered In six
months. The machine. 1t is stated. will
have to be built at the reservoir, as there
Is no navigable stream connecting with
the reservoir on which IL could be foated
to the point wanted If 1t was built else
where.
The description OF the machine wanted
Is given In the specifications issued from
the office of Capt. Crosby.
Description of Dredge.
1T is the intention of this office" the
specifications recite. Ito purchase a first
class hydraulic dredge complete in every
detail, to consist Of a hull with cleats,
chocks, spuds. derrick and house COM
plete; one ten-inch centrifugal sand dredg-
ing pump directly connected to and operat-
ed by 1OO-horsepower steam engine or
turbine: one winding and hosting engine
for swinging the dredge ard hosting the
spuds and suction pipe; one cutter and en-
CINE for loosening the material to be
dredged; one 15O-horsepower steam boiler
inch; one suction pipe and ladder; 1000
feet Of discharge pipe in twenty foot
lengths with rubber Joints with bands;
forty pOntoons; four 15O-pound anchors:
three Compound anchors: 1900 feet of three
quarter-inch steel wire hosting rope and
1000 feet one-inch Manila rope: one deck
scow about twelve feet by twenty feet by
two feet; two rowboats with oars and
rowlocks one set of pipe stocks. taps and
dies one-half inch to two inches; a good
portable forge; anvil and blacksmith tools;
taps and dies for threading one-quarter to
one-inch bolts and a full set of wrenches
and other tools and spare parts as are fire.
Quently needed.
The hull shall be rectangular In plan
with vertical sides and ends The length
over all is to be sixty-six feet. the width
twentyfour feet and the depth six feet
THE dredge is to be used by the govern
ment for removing the mud and sand which
have been deposited from the water supply
of Washington in the Dalecarlia reservoir
during the past forty years Storage room Is
to be provided on the dredge for supply Of
coal to last at least sixteen hours. The reser-
voir is about forty-five acres in extent and
is we'll protected from wind action. The
depth of the dredging to be done will vary
between two and twelve feet; the maxi
mum lift will be twelve feet above the sur
face OF the water and the maximum length
will be 1000 feet
Given Thorough Trial.
1t Is specified that soon as possible
after the completion OF the dredge 1t will
be given a thorough trial under actual
working conditions. During this trial It Is
intended to ascertain the efficiency of the
pump and engine whole and also the
strength and suitability Of each detail con-
nected with the dredge. The pump will be
required to discharge at least 2,300 gallons
Of water per minute against total mead
of forty feet. The main engines shall be
fully capable Of operating the pumps under
the above conditions with a
Of 100 pounds per square inch and shall
run smoothly and satisfactorily for at least
two days of eight hours each at the re-
CURED rate of speed. The contractor must
furnish the crew and all necessary sup
plies for the above trial.
By removing the accumulation OF sand
and mud in the reservoir the engineer OFF,
GERS. 1t Is stated. believe that they will add
much to the purity of the water used In
this city. The new dredge will not be
temporary affair. but will be OF use for
many years to come In keeping the reser-
yoir clean and preventing any accumula-
ion Of sediment such ~ now exists.