Richmond enquirer. [volume] (Richmond, Va.) 1815-1867, 1833-04-30
TREASURY DEPARTMENT, ,

April lith, 1888 :
IL ON the plan of tho Bridge authorized TO be built
across The Potomac River, at the City OF Washington
proposals sealed aud endorsed, will be received by the
secretary or the Treasury until the 10Th of May inclu-
slve or The materials and workmanship the same agree
ably to the terms and specifications OF the work.
The Bridge vii. have fl arches and draws 42 piers
and abutmens with their halt piers The arches to be
SO feet span and 20 feet rise above the sprngnp line and
TO DC curves OF several cen,ers semepses The pi-
and abutmens to rise feet above low water and 10 be
OF sufficient breadth to sustain each the force of its depen
dent arch.
The draws TO be each 65 feet wide:-one IN ha n,aa
at the Mary land, ahngion channel the other at the
Virginia channel The bridge to be SO feet wide between
the papes aud the carriage and foot ways be horizon
tai from abutment TO abument. The piers arches and
Noumens to be OF granite, and to be founded piles or
on the solid rock according the of the bottom
lhe parape's to be each Is inches thick and high
above me roadway. The arches TO be feet inches
thick at the key, and feet inches at the sprneng line:
except the facing ring stones the extrados of which
will be segment OF circle be described with the
greatest radius OF curvature.
The launches to be filled in with good rnbble mason
ry laid IN mortar TO height that shall be sufficient in adj
don to the weight OF the deadwaf ng, together with
that OF the parallel brick walls the backs &C. to ba-
lance equaliherate the arches
The road way TO be nine inches thick Macamzed and
to rest on Hat stones laid the brick spandrell walls
The foot ways to be raised above the level of the
way and Tagged The water to be carried oil by suf
clent drains aud pipes over the backs Of the arches ani
through the piers and abu,ments.
On the dead-walng, the piers forming the facing
OF the pier-heads, plIsters of granite to be placed
The piers TO be least II feet broad aud 80 feet ,on n,
the pringug line, and be 10 feet broad at low wafer
The pier heads TO be truncated cones, capped-he
upper radius eet inches, and the lower such that the
perhead shall batter in not more than feet below
low water
The draw-piers 10 be % feet broad at the springing
me ana to batter as in the OF all the other piers
except on the side OF the draw which is to be vertical
TO 6 feet below low water.
The piers at greater depth than feet below low
water to batter in II, and have sufficient osetts ali
around them. 49,
The abuments to have the same thickness as the draw
We of he iicEna of kolF.
masonry of the piers, halt piers and abumen 10 he of
rough work of hard granite very are
LAID IN hydraulic cement The arch stones pilasers cor
dom and parapets 10 be range work, rough hammered
The parallel walls the back of arches and piers TO
be OF hard brick and together with all other masonry
aDoVe'he splhgng line to be laid in the best lime mortar
The timber to be used in the foundations TO be yellow
pine white oak
The masonry OF the piers and abunenls to be carried TO
the depths indicated by the following table which exb-
bits also the depth of the alluva deposit at distances of
10 iee proceeding from the Washing ton abutment