, 1889-12-18

FLOOR AND RAILS.
Each span will consist of two trusses
with a highway between them and a side
walk outside of one. Allowance is made
10 floor ioIst for a horse car track next to
one truss.
A continuous hand rail will be built on
the outside of sidewalk the full length of
the viaduct, between each of the trusses
Of each span and over the ~trestle spans in
line with each truss. There are to be
then, three lines of hand rails and guards
the full length OF the viaduct.
INSPECT MATERIAL.
All material is to be subjected to the in
spection of the engineer in charge and all
material will be carried free over the
Union Pacific.
TESTING.
The contractor must from time to time
furnish facilities for a proper test of his
work SO far as completed. The city must
pay all inspection costs.
PROTECTION.
Acceptance of any material shall not
prevent its subsequent condemnation if
found faulty.
WROUGHT IRON.
All wrought iron must be tough, duo
tile, 6brous and free from imperfections
Of any sort.
Figures for tests are given.
OTHER IRON.
All plate iron shall be rolled in a Uni
versatile mill. 1t shall have.a minimum
ultimate strength of 4s. 900 pounds a
square inch and an elastic limit of 26, 900
pounds an inch.
Riyet iron must be soft and tough.
All bar and rod iron must stand bend
ing cold through $50 degrees to a curve
whose inner radius equals the thickness
of specimens without showing signs OF
fracture.
All cast iron shall be of the best quality
of tough gray iron, free from flaws. Sam
pie rough bars are to be tested.
LUMBER.
Timber and lumber used shall be of
the best quality of its kind and shall be
straight. square, sound, sauare-edged and
free from bark, sap, large or loose knots
and other ordinary faults and dry and well
seasoned as the market affords. Timber
shall be red or yellow Oregon fir, except
the two Tenders at the sides of the high
way, which will be of white a and well
seasoned at the ioists. Plank for floor
shall be not less than ten nor more thar
twelve inches wide and will be secured to
the ioists with wire nails, using two nails
to each joist in every plank. Sx-inch
wire nails will be used with three inch
plank and ve.inch nails with two inch
plank. The plank must be of uniform
thickness and each will extend the iul
width of the bridge.
II WORKMANSHIP.
All work shall be first class in every
particular. All r~ivetinQ possible must be
done in the shop. reducing field r~ivetine
to a minimum or avoiding it altogether.
All joints shall be square and truly dressed
and rivet holes shall be accurately spaced
anu must pc completely nlleu.
PAINTING.
The loose scale shall be scraped from
all iron work and it shall be given one
good coat of paint before leaving the
shop. Surfaces. coming in contact vii
be painted before riveting. All enclosed
surfaces shall receive two good coats O.
paint before being put together. Aitel
erection the entire structure shall hay,
one good coat OF paint. Mineral pain
OF a brand to be approved by the engi
neer and mixed with pure boiled linseet
oil and will be mixed on the work.
Action of the Council.
City Attorney Potter spoke of tn,
financial difficulties OF the viaduct situa
ton going over ground heretofore ira
varssd and making the matfar claar IN oil