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Washburn, F. E. (ed.) / The Wisconsin engineer
Vol. 5, No. 2 (May 1901)

Burgess, Geo. H.
Bridge inspection,   pp. 188-193


Page 188


Tss                TDe lW'iscowsisln EnglslceP.
mum length of the valve rod is the same as the crank end outlet
valve rod; thus it will push the valve shut at the proper time
as in our present diagram; but when moving in the opposite
direction the valve is dlelaye(l by the lost motion in the rod end
just enough to compensate for the error introduced by the angular
action of the connecting rod. It will be noted, however, that this
reduces the valve travel, and care must be taken that this does not
red(1uce the port opening too much.
                  BRIDGE     INSPECTION.
            GEO. Ht. BURGESS, Asst. E'ngineer Penn. R. R.
  In giving these few ideas as to methods pursued in the in-
spection of bridges and the materials used in construction, the
writer will not endeavor to go beyond a somewhat brief description
of the ordinary practice of the railroad company upon whose
inspection staff it has been his privilege to serve at various times,
an(l the inspection of steel bridges only will be considered.
  The complete inspection of a bridge from the time of the award
of the contract for its construction to the day it is pronounced
completed and all slow orders" for trains are removed, may be
divicle(l into three parts, given in the order in which performed:
M\ill, shop and field inspection.
   M\ill inspection as its name implies, consists in looking after
the manufacture of the raw materials at the rolling mills. Upon
the award of the contract for a bridge to one of the bridge com-
pamies, the order is immediately sent forward to the drawing room
where enough pencil sketches and drawings are made to allow the
bills of material to be made out.   This material should be
ordered as speedily as possible as considerable time must neces-
sarilv elapse before the material can all be rolled. The mills
have regular schedules governing the rolling of the various sizes
of material and the mill order is distributed over the schedule
in its proper rotation, and. in these days of large demand, it
is almost impossible to obtain any variation from fixed schedules
for delivery of material. The inspector is furnished with a copy
of all bills of material, or mill orders as they are called, and he


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