The republic. [volume] (Washington [D.C.]) 1849-1853, 1851-05-15
TO CONTRACTORS.
OFFICE OF THE CoMnIssIoNER OF PUsLIc Bull
w AcuINGrON Anril % I

OFFICE OF THE COMMISSIONERS OF PUsLIc BuiLpINos,
WAsHrNaroN, April "a, 1851. !.
PROPOSALS will be received at this Office until
Il IL o'clock, M. on the 10th day Of May next,
for constructing bridge across Tiber creek, at it's
intersection with New Jersey avenue and street
north The bridge. when finished, will be l72 feet
long, with an elliptic arch Of "a feet span and 81
feet rise from its springing.
The pit for the foundation must be excavatcd to
such depth superintendent ofthc work. to be APP
pointed by the Commissioned, may direct. A foun-
dation course of sap pine logs, 10 by - inches
square, will then be laid three feet from centre to
centre, transversely to the axis Of the arch. ex-
tending to the back lines Of the side walls Three
rows Of aheet piling, three inches thick and five
feet long, will then be driven the upstream sides
ofthrce of the ogs viz One in the centre and one at
each end ofthc pit, and quite and
to the logs; piece of timber, 10 by IL inches
square, will then be inch into the trans
verse logs for the whole distance Of the culvert
both Sides the line Of the face of the side walls
the inner edge of which is to be chamfered, and be
properly secured to the foundation timbere; floor
ing three inches thick OF Carolina or q corgia pine,
will then be laid the whole surface of the foun
dation timbcrs, and secured to them by wrought
iron spike through each plank into each log It may
cross, and in addition to this, tree nail OF oak or
locust, inches square and IA inches long, must
be driven into each log, through each plank, cx-
cept those under the side walls.
The side walls will probably be about six feet
high from the floor to the spring of the arch. The
arch will then be laid eighteen inches deep. after
which the side walls will be carried up TO its crown,
filling over the arch to its crown with solid mason
ry. The side walls will have average thickness
of four feet.
Parapct walls, Ii inches thick and 81 feet high,
will then be carried up upon string course Of
utgranitc inches thick, the whole to be COPIED
with good sandstone inches thick at the edges,
with saddle back of two inches. Wing walls
will be laid 80 far may appear to be necessary,
the average thickness OF which will be % feet.
Tho arch and parapet walls will be Of the best
hard brick all the other masonry will be Of largo
size blue rock gneiss dnd the whole TO be laid in
mortar made of lime, sharp sand, and portion OF
hydraulic cement, except that the side walls, on
which the arch il rest must be laid for one foot
from the face and four feet high. in hydraulic &C.
ment and suitable quantity Of sharp sand, with
out any quick lime.
The whole of this work is to be done in the best
manner and of the best materials, under the direc
ton Of the before. mentioned superintendent, and
to be completed by the frat day Of September next.
Persons proposing will state sheir price per cubic
yard for excavation of the foundation; per 100 feet
board measure for the flooring and piles; per cubic
foot for the squared timber; per perch of % cubic
feet for the stone masonry; per thousand for the
course, and per foot nca for the sandstone coping;
including all materials, ccntrng, Golfer dams,
tools, &c. And no proposal will be considered
which does not fully conform to this requirement.
contract will be entered into, and bond with
security will be required for it's faithful perform
ancc. Persons offering will, therefore, please to
give the names of their proposed surctics.
The Commissioner reserves the right OF reducing
the length Of the bridge to 80 feet.
Any further information can be obtained by ap-
plying at this Office, where the plan may be seen.
Commissioner of Public Buildings.
Ap 2o-2aw3w