The republic. [volume] (Washington [D.C.]) 1849-1853, 1852-12-21
PROPOSALS FOR DREDGE-Boars.
" Az DEPARTMENT.,

NAR DEPARrMENT,
| BuREAu CoRPs ToPoG PnIcAL EHGINEERs,
December 3, 1852
PROPOSALS will be received until and iuclud.
| L ing the 10Th day OF next February, for the
construction of four steam dredge- boats. to be
worked by high pressure engines, viz:
One for Lake Champlaiu, to be delivered, in
speoted, and received ut White Hall Hartor. On
Lake Champaign.
One for Lake Ontario, 10 be delivered, Inspect.
ed, and received at Oswego, on Lake Ontario.
One for Lake Erie, to be delivered, ins pects 4,
and eceiv ed at Erie, on Lake Erie.
One for Lake Michigan, to be delivered, in
spccted and received at Chicago, Illinois.
The hull of each boat to be ITO feet long, 80 feet
beam, with guards feet wide, sufficient for buck
et-ladder and paddle wheels. to draw when
equipped not exceeding feet IF water.
Tohave two cylindrical boilers, made of the best
boiler iron, ono quarter Of an inch in thickness.
tw' two feet long, and forty inches in diameter
each.
The working cylinders of the engine to DC
twelve inches diameter inside, not less than half
inch thickness Of metal, and to have a length
Of stroke of four feet, with half stroke cut. off
Each boat to have paddle wheels for loComo-
ton. witt, suitable accommodation for the officers
and hands required to manGuvre and work the
boat. say captain, mate, pilot, engineer, and
twelve hands; also suitably constructed coal
bunkers for about fifty tons of coal
No advance will be made on a contract, nor will
n boat be received paid for until after it has
been inspected and tried, and found to NEE, the
terms OF contract.
Each boat will be supplied with a good four
cared yawl- boat, ~ feet long and with four good
oars, and also suitable yawl- boat and oars for
assisting in wei ghing anchor
The boat will be inspected in reference to ar.
rangements, materials, and equipment, and will
be subject to the following trial:
lst. AS to locomotive power. 1t will have TO
move not lees than 100 miles in calm weather,
the waters Of each lake respectively, in consecu-
tive hours, at rate of not les5 than six miles
the hour.
ID. AS to dredging power. 1t " i'll have to raise
t,tn Of
yards the hour; Of a loose mixture of clay and
sand, part sand and parts clay not less than
100 cubic yards the hour; Of pure clay ~ cubic
Yards the hours of tenacious clay, and of sand and
gravel, 60 cubic yards the hour, from depth Of
not less than 10 nor exceeding IL feet.
This must be the continued work of the boat Z
during 10 hours, and not an average during any
shorter tine of work.
Each boat will have to be supplied with
Choir of not less than 500 lbs, and too kedge an
chors of 200 lbs. each; and with an adequate chain
cable of not less than 10 fathoms long, of ! iron.
Also a q -inch hemp cable 100 fathoms long.
The trials will be under pressure of steam for
dredging not exceeding so pounds the square
inch; for locomotion not exceeding $50 pounds the
square inch.
The trials and inspection to be made by Uni
ted States agent.
The boats to be ready at the places stated by the
last day of May next.
Proposals will at the same time be received for
four discharging scows for each dredge boat, each
scow to be provided with two good sweeps, and
with bottoms SO arranged as To dis charge the whole
load at once. Each boat capable of holding not
lees than 40 tons OF excavated soil.
Proposals to be addressed to the undersigned,
and marked on the envelope proposals for
Dredge boat"
J. J. ALERT,
Col. Corps Top. Engineers.
The Republic, Intelligencer, and Union, Wash
ngton; Courier and Enquirer, and Express, New
York; Commercial Advertiser, Buffalo, N. Y;
Advertiser. Detroit, Mich; Commercial Adver-
tiser. Chicago, H.; Commercial Times, oswego,
N. Y; Pittsburgh Gazette, Pittsburgh, Pa; AL
bany Register, Albany, N. Y, will give the above
twenty daily Intentional. then twice week until