Butte record., 1855-01-27
ABUTMENTS OR PIERS.

about Two hundred and forty feet apart Its
foundation is to be ieyeled an sold Each
abutment might be thirty feet long. ten feet
wide, 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-sllllI be raised about one
DOT above the road way. These abItmentS
shall have n groove on their face towards each
other, OF the proper Dimensions and quality,
for the road way 10 abut against.
These abutmcnts or piers shall BE- &C ns.ruct,d d
Of the strongest and best quality of stone
within one 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
and groutel. The cement to be the best and
most durable.
There shall be four towers, cast iron or
stone They shall each be conf osed IF four
east iroa columns, incl mug iuwnris Mt the
tip, and their base resting on. aud fastened to
4 tabular iron Plate OF sufficient SIZE and
stfenElh. Said plate thall be anchored to the
pier The columns at the top shall be firmly
un tel To each other, and 50 Constructed that
he towers IN the same side, can he firmly
fastened at the top to ea0h other hy an iron
cross bar Of sufficient strength. Said cross bar
to have iron bracse connecting it with the
q
view to fasten the cast iron saddles, over which
each cable is to pass. The saddles are to be
seated on rollers on the top Of the towers 50
that tie cables can accommo late themselves
The same to be done securely. They are to be
sixteen feet hi n, and lear a pressure Of nine-
~ tons
II the towers should be constructed with
stone, they are to be sixteen feet high and
sufficiently strong to bear 4 pressure Of ninety
tons, with proper batter, to be connected at
the top by cross-bar of iron or timber, and
braced to the towers. The tops shall receive IN
iron plate. made fast and permanent to the
tower, to which shall be fastened the cast iron
saddles made rs aforesaid.
The roud way is to be eighteen feet in the
clear, and the timber used shall be yellow
Pine, cr other timber OF equal strength and
dul ability. 1t is to be crowned at the centre
about two feet The road bearers are to lie
four by twelve inches, and not less than tweu-
~ 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, anl shall at least be one for every
chain, three aud -a-ha!f feet apart. The road
way bearers shall be covered diagoEally with
plank two and-a-half inches thick by not less
than twenty-five feet l5ng upon which flooring
there shall be a second flooring Of the same
thickness and dimensions, layed in n cross di-
agonal to the first, each to be thoroughly
spiked. Inside of the suspendng chains a
piece of timber two by eight inches shall be
layed the length OF the road way, which shall
be fastened by iron bolts to every fourth road
bearer.
THE PARAPET
Shall be constructed on the principle Of
Towns Lattice. The upper cord slal be a
curve with a crown of not less than five feet
above the crown of the Bridge Tie cords
shall be two by eight inches, with diagonal
braces. with three and a-half feet run
screwed together with iron rods; also, iron
straining-rods, connecting the upper cord of
the parapet with the / bearers, and the
same screwed together firmly The circular
cords of the parpet at each end to be securely
anchored iato the stone abutments The road
bearers that are twenty y-fve 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 a corresponding num-
Der on the inside. The parapet is to be built
on the inside of the inner cables, and eighteen
feet apart.
The work in every part and particular to be
done in the best and most woi kmanlike man
ner. The iron to be used to be the best Ameri-
can irou-
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