Butte record., 1855-02-17
SPECIFICATIONS

I
| paRy.
! The Bridge may lave a span Of two hun
1 dred and forty feet, measured il a straigh
line from pier to pier There are to be foul
wire cables two on 4 side, about two inehe:
apart, on the same plane Each cable to con
tain three hundred wires, size number ten
each wire in said cables to be first stretch
| ed, tested, and freed from kinks aud if of tht
proper strength, to be thea laye1 together
cozl zlpaetly, giving to each wire IN position. tn
same tension Each wire, before they shal
! have been made into the cables, shall be dip
ped several times into linseed oil. boiled will
small portion Of liIherage and lampblack.-
Each cable IS to raped spirally With a wir,
| tightly. Each cable before being placed 10 it:
position, is TO receive thick coating of II;
foregoing preparation Of Euseed OF! Nc, anC
finally painted with wite lead palRt. Each O
said cables when placed in its position. to havt
the same sine and yersine. The swag O.
each cable 10 be not less than twelve feet
The cables at each end are to run over tow.
ers. and resting on east iron saddles, the same
as hereinafter mentioned, running back with
Z. versine to the tower, twenty feet, on to the
point. where they strike the anchorage, each
being fastened to different anchorage on the
same line, on the same plane, and making
equal versines. The anchorages are to be
wrought iron bars, imbedde1 securely to the
best advantage in the bed rock. so that each
anchorage will bear pressure or pull in the
direction Of tho cables, equal to one hundred
tons. the same to be done in the best and most
durable manner Each cable is to be fastened
70 the anchorage by an adjusting screw or
keys, IN the most approved manner, having n
strength equal to, or greater than each cable
The suspension Chains are to be of number
ten wire and about three fourths OF an inch
in diameter, each wire to be tested and paint
Ell as those in the cables. Said chains are to
be fastened alternately to each cable They
are to be fastened at the top to their respect-
i've cables, by an iron saddle clasping the ca
bic securely. The saddle and suspending
chains on each cable are to be apart alternate
ly seven feet, measuring from the centre Of
each saddle through the entire span, making
the road-wsy bearers three and-a-half feet
apart The saddles on each cable are to be
fastened one t. the other IL Z suitable manner.
BY number seven wire lappinr lis respective
cable three or more times between cash saddle
The chains at the lower ends are to be fasten
ed securely to stirrup that shall clasp the
tranYersel road bearers. The stiyrups at the
susQeudlng points to be made with an impress
sion at the point Of suspension to receive the
chain. These chains from the point Of sns-
pension are to have a slight and uniform obi
qulty towards the longitudinal axis Of the
Bridge. as well as towords the centre OF the
curve
ABt.TMENTS OR PIERS,
There is to be one on each side Of the river.
about two hundred and forty feet apart lis
foundation is to be ieveled ami solid Each
abutment might be thirty feet long, ten feet
vide, and twelve feet high, where the road
way passes above high warter mark That
particular portion of the pier which IS design
ed TO support the towers. if the same shall be
built OF cast iron-shall be raised about one
foot above the roadway. These abutments
shall have groove on their face towards each
other, Of the proper Dimensions and quality,
for the road-way to abut against.
These abutments or piers shall be constructed
Of the strongest and best quality Of stone
within oue-half mile Of the site Of said Bridge
The same Is to receive batter on all sides =
The stone IS to be layed in hydraulic cement
AMI g.outed Tie cement TO be the best and
most durable The work to be dressed Rub
bic Masonry.
There shall be four towers, cast iron or
stone They shall each be composed Of four
east iron columns, inclining inWards at the
tep, and their base resting on and fastened to
. Nf+BAtH- 4itA iitHlt u Sul-4NItuI size ana
stfengfh Said plate thall be anchored to the
pier. The columns at the top shall be firmly
united to each other, and so constructed that
he towers on the same side, can be firmly
fastened at tue top 10 eaoh other by an iron
cross bar Of sufi ;ient strength Said cross bar
to have iron bracse connecting it with the
towers. Each tower 10 be constructed with a
view 20 fasten tie cast iron saddles, over which
each cable is to pass The saddles are to be
seated IN rollers on the top Of the towers so
that tie cables cfn accommodate themselves
The same to Toe done securely. They are to be
sixteen feet high, and bear pressure Of nine
y tons.
If the towers Should he constructed with
stone. they are to be sixteen feet high and
sufficiently strong to bear a pressure OF ninety
tons, with proper batter, 10 be connected at
the top by a cross bar of iron or timber, and
braced to the towers. The tops shall receive an
iron plate. made fast and permanent to the
tower, to which shall be fastened the cast iron
saddles made as aforesaid.
The road way is to be eighteen feet in the
clear, and the timber used shall be Yellow
Pine, or ether timber Of equal strength and
durability. 1t is to be crowned at the centre
about two feet Tho road bearers are to be
FIVE by teHinchss, and not less than tWen-
ty feet long excepting every sixth one, which
shall not be less than twenty FIVE and-a-half
feet. The road bearers are fastened to the
suspending chains bp stirrups as heretofore
described, and shall at least be one for every
chain, three anl-a-balf feet apart The road
way bearers shall lee covered diag9nally with
plank Two anl-a-half inches thick by not less
than twenty-five feet l5ng, upon Which flooring
there shall be u second flooring of the same
thickness and dimensions. layed IN a cross di-
aganal to the first, each to he thoroughly
spiked. Inside Of the suspendiHg chains a
piece of timber two by e:gLt inches shall be
iayed the length Of the roadway which shall
be fastened by iron bolts to every fourth road
bearer.
TIE PARAPET
Shall be constructed on the principle of
Towns Lattice. The upper cord shall be a
curve with a crown of not less than FIVE FEET
above the crown of the Bridge The cords
shall be two by eight inches, with diagonal
braces. with three and-a-haIf feet run,
screwed together With iron rods also, iron
straining- rods, connecting the upper cord Of
the parapet With the road bearers, and the
sarze screwed together firmly The circular
cords Of the parpet at each end TO be sec4rely
anchored iath tie stone abutments Tie road
bearers that are twenty-five and a half feet
long. are to be braced at each end to the para
pet, to prevent any outward pressure Of the
parapet. There is to be corresponding mum
Der on the inside. The parapet is to Le built
on the inside of the inner cables and eighteen