The citizen-Republican. (Scotland, Bon Homme County, S.D.) 1???-19??, 1904-09-01
its attendant outfit, was approximate

With the view to giving the greatest
relief possible to navigation during the
low water season by temporary eXpedi-
ents. authority was obtained from the
chief of engineers to construct a second
hydraulic dredge. Major Handbury's
description OF the boat, while necessar-
lily somewhat technical, will prove in
terestinS to all engineers Inc some river
men especially. One OF the most re-
Gently constructed model barges used
Tor transporting stone vas selected"
says he, land gives such additional
strength by bulkhead timbers as was
necessary to enable it to sustain the
heavy machinery to be placed upon 1t
without vibration when in motion.
DESCRIPTION OF THE BARGE.
This barge Is 135 feet long. with IS
feet beam. and has 6 feet depth Of hold.
On it was placed a twenty inch centrif-
ugal pump, actuated by a. horizontal
compound condensing engine, connected
directly with the pump shaft. Diameter
of high pressure engine, Il inches; di-
ameter of low pressure engine, % inches,
with IS inch stroke. The pump and en-
CINE are upon the sarne caStiron base.
Steam IS furnished by, three boilers,
Mississippi river type. 4S inches in di-
ameter n % feet long, each having
five nueS II inches In diameter. The or
binary working steam pressure of the
boilers is 40 pounds. The engines make
200 revolutions per minute, and the
pump discharges about 1000 cubic feet
of material. On the basis hat 10 per
cent OF this IS saved, which is a very
reasonable estimate, the dreGge will eX-
cavate about $50 cubic yards per hour.
The suction pipe is 20 inches in diameter
from the pump out to the bow of the
boat. At this point the pipe branches
TO the right and left with a quarter turn
10 inches in diameter. At the ends of
these there are a stutfing box and an
other quarter turn which permits the
pipe to extend down over the bow Of
the boat and into the water. These
stuff1ng boxes allow each branch of the
pipe ITO Owe in a vertical plane. AT
them lower ends these pipes separate
by Us into branches, each II inches In
diameter, n terminate in nozzle pieces
with openings so inches by 6 inches.
The two Is inch pipes are tied together
by suitable bracing, and raised and
lowered by means Of a derrick with
boom extending u beyond the bow.
The hosting power is obtained from a
pile driver engine taken from the plant.
This same engine is used to haul the
dredge about and keep it up to it's work.
Immediately at the pump the discharge
pipe makes a quarter turn and Is en-
larged to "a inches in diameter. It
passes back through the boat and over
the stern onto f1atboats, which support
it for a distance of 500 feet. AT the stern
Of the boat there is an S shaped piece in
the pipe having a horizontal swivel
point, which permits the discharge to
be made in any horizontal direction,
Where the pipe passes from one fiat to
another there is a short piece Of Para
rubber hose. which permits a flexible
motion. The 1atboats on which this
pipe is supported are a part of the out
fit Of the plant used for low water re-
vetment.
DREDGES TEMPORARY EXPEDI-
ENTS.
To operate the 6redge piles are driven
on each side Of the channel TO be opened
and at some little distance from It. Lines
are made fast to them and the dredge and
discharge pipe manipulated by means OF
them. This dredge was not completed un-
til the end of November, about the tire
the river commenced to rise. There was
no opportunity to give 1t a practical test
a chann bar. but 1t was operated
experimentally for several days, and all its
parts thoroughly tested. It bids fair to bs
a very satisfactory machine. It's cost was
81, 7o5.
The dredges above described are, how
ever, what may be termed temporary ex-
periments, constructed hastily to meet the
urgent requirements of low water navi-
cation during last season. With the object
obtaining a moro permanent plant Of
this kind and to comply with the provls-
ions of the river and harbor ..ct of Juns
1895, a thorough study OF the subject OF
dredging as applied to river bars was
made. This has resulted in a type of
dredge of large capacity ard large
draught, which is easily handled, has am
Pile accommodation for it's crew and at the
time can readily dispose of its own
dredged material, beyond the lateral limits
OF the channe to be improved. The main
FEATURES OF the dredge are briefly de-
scribed by Major Handbury as follows:
"Ihe null to be made Of steel throughout
and to be 100 feet long. 40 feet beam and q
feet, 6 inches depth Of hold. There is an
at the bow In which the suction
pipes are placed, "a feet at forward end, "a
feet at after end, by 81 feet long. The two
projecting ends thus formed are tied to-
by a box girder. There are two
centrifugal pumps with suction and dis
openings 20 inches in diameter. The
discharge pipe Is Immediately enlarged to
"a inchesn diameter. The pumps are single
suction, with interior lining capable of be-
Ing conveniently removed when worn.
PUMP, ENGINES AND BOILERS.
Each pump is driven by a horizontal
~non-condensing compound direct connect
engine, 15-inch high pressure, 26-inch
pressure, with 1s-inch stroke, capable
Of developing 800 actual horsepower. with
approximately zoo revolutions per minuts
under a boiler pressure Of l4o pounds pe-
square inch, and maintaining through the
suction and discharge pipes the velocity
to carry at least 20 per cent OF
with so per cent Of water through 500
feet of discharge pipe. The steam is to be
supplied by six boilers Of the Mississippi
river steamboat type, each As inches in
diameter and Is feet long, and containing
five dues each II inches in diameter. Thu
boilers are arranged IN tive batteries OF
three each, capable OF being worked sep-
arately or together. With each main
there is a Jet pump for applying
water under pressure through nozzIes to
the sand at the entrance to the suction
pipes. The Jet pumps are OF the Worth
type, with compound engines ca
of delivering 1900 gallons per min
ute against a pressure of S. pounds. Tho
pipe of each main pump has a
OF 20 inches. IT 1eayeS .ba ~,