The Kimball graphic. (Kimball, Brule County, Dakota [S.D.]) 1883-1905, 1904-09-02

exits. authority was obtained from nh,
chief OF engineers to construct a secon,
hydraulic dredge. Major Hamburg;
description of the boat, while necessar
lily somewhat technical, will prove in
teresting to all engineers and some rive
men especially. One Of the most re.
Gently constructed model barges USED
for transporting stone was selected
says he. and gives such additiona,
strength by bulkhead timbers as was
necessary to enable 1t to sustain the
heavy machinery to be placed upon 1.
without vibration when in motion.
DESCRIPTION OF THE BARGE.
This barge Is 135 feet long, with %
feet beam, n Ia s feet depth Of hold.
On it was placed a twenty lnch centrif-
ugal pump. actuated by a horizontal
compound c~ondensing engine, connected
directly with the pump shaft. Diameter
OF high pressure engine. IL inches; d.
ameter of low pressure engine. % inches,
with is inch stroke. The pump and en-
CINE are upon the same castiron base.
Steam is furnished by three boilers.
Mississippi river type, As inches in d.
ameter and % feet long, each having
five hues 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 tina 10 per
cent of this Is saved. which is a very
reasonable estimate, the dredge 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
fN tho rtolt ND 1aet ,-t - l.
10 inches in diameter. At the ends OF
these there are a stufing box and an
other quarter turn which permits the
pipe to extend down over the bow OF
the boat and into the water. These
stufting boxes allow each branch of the
pipe to in a vertical plane. At
their lower ends these pipes separate
by Us into branches, each IL inches in
diameter, and terminate in nozzle pieces
with openings so inches by 6 inches.
The two Is nch pipes are tied together
by suitable bracing, and raised and
by meal OF a derrick with
boom extending out beyond the bow.
The hosting power is obtained from a
pie driver engine taken from the plant.
dredge about and keep 1t up to it's work.
oS Liz pump Il1S ulSCldESS
pipe makes a quarter turn and is en-
larged to "a inches in diameter. 1t
passes back through the BOAT and over
the stern onto natboats, which support
1t 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
hose. which permits a flexible
motion. The fatboats on which this
pipe is supported are a part Of the out
of the plant used for low water re-
vetment.
DREDGES TEMPORARY ENPEDI-
ENTS.
To operate the 6redge piles are driven
on each side of the channe to be opened
and at some little distance from 1t. Lines
are made fast to them and the dredge and
discharge pipe manipulated by means OF
hem. This dredse was not completed I'M
til the end of November, about the time
the river commenced to rise. There was
opportunity to give 1t a practical test
upon a channel bar, but 1t was operated
for several days, and all It.
parts thoroughly tested. It bids fair to be
l very satisfactory machine. It's cost wa,
~ .705.
The dredges above described are, how
.ver. what may be termed temporary ex-
'eriments. constructed hastily to meet this
Urgent requirements of low water navi-
cation during last season. With the object
II obtaining a moro permanent plant OF
his kind and to comply with the provis.
ons of the river and harbor act Of Juns
/. 1S96 a fh0rn11oh cf,,HNy 1P +ho ,,h3a.A
lredging as applied to river bars was
This has resulted In a type OF
lredge of large capacity and large ,
lraught, which is easily handled, has am
'le accommodation for its crew and at tho
time can readily dispose of its own
lredged material, beyond the lateral limits
the channel to be improved. The main
eatures OF the dredge are briefly de-
cribed by Major Hamburg as follows:
The hull to be made Of steel throughout
nd to be 100 feet long, 40 feet beam and
eet. 6 inches depth Of hold. There is an
peninS at the bow In which the suction
'lpes are placed. "a feet at forward end, IS
eet at after end. by 81 feet long. The two
ends thus formed are tied to-
ether by a box girder. There are two
centrifugal pumps with suction and dis
harge openings 20 inches in diameter. The
ppo u l414i1leOldle1y enlarged to
1nchestn diameter. The pumps are single
ucton. with interior lining capable of be-
ng conveniently removed when worn.
PUMP, ENGINES AND BOILERS.
Each pump is driven by a horizontal
on-condensing compound direct connect
d engine, 15-inch high pressure, 2G-inch
Nv pressure. with 1s-inch stroke, capable
I developing 300 actual horsepower. with
200 revolutions per m.nute
nder a boiler pressure OF 14o pounds Der
quare inch, and maintaining through the
uction and discharge pipes the velocity
ecessary to carry at least 20 per cent OF
and with 50 per cent of water through 500
eet of discharge pipe. The steam is to be
by six boilers OF the Mississippi
iver steamboat type, each 4s inches in
and Is feet long. and containing
We fues a II inches in diameter. TIL. j
oilers are arranged in two batteries OF
hree each. capable Of being worked sep
rately or together. With each main
Jump there is a jet pump for applying
'ater under pressure through nozzles to
he sand at the entrance to the suction
lpes. The Jet pumps arc of the WORTH
agton type, with compound engines ca
able OF delivering 1920 gallons ner win .