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adjusted anchor plates anchorage auxiliary chords bend blocks bolted cast iron cement center line chamber condition covered curve dead load deflection depth of truss diameter elastic limit elongation erection factor of safety feet foot Hence holes iron beams joint LEFFERT L length loaded segment lower cable lower chord lower floor beams machine masonry material middle modulus nearly Niagara Niagara Falls nick notches o o o old beams old chain painted pieces Pittsburgh Bridge planking portion position posts proper punched and reamed renewed resist rivet rock screw secured shoes span specimen splices square inch steel chord strain per square strands stress structure SUSPENDED SUPERSTRUCTURE Suspension Bridge tension tests thickness tons total section towers track stringers transverse truss rods ultimate strength upper beam upper cable chains upper chord upper floor beam Vernier scale vertical wedge weight wind wire rope York side
Page 14 - ... CE, examined the cable near one of the shoes, and found some of the wires corroded quite through. Further tests showed that the outer layer alone was affected, the second layer of wire being sound and bright. The evident cause of the corrosion was the elongation and contraction of the strands under passing loads, which had loosened the cement from the outside strands, allowing moisture to work in. The defective wires were cut out, and new ones spliced under strain, and attention was then directed...
Page 12 - After the plant had been in use for some time it was found that the temperature of the flue gases at the base of the chimney reached a maximum of 700° Fahr.
Page 25 - Tests. square inch of section, and an elastic limit of not less than half the tensile strength, with not less than 56 per cent of ductility, as indicated by contraction of area at point of fracture under test, and by an elongation of 25 per cent in a length of 8 inches.
Page 27 - At that time we had stripped the old bridge of all superfluous material, as cornices, the rails forming the broad gauge track, &c., in all decreasing the weight about 80 tons.
Page 24 - May 28th the bids were opened in the presence of the Board and the contract awarded to the Pittsburgh Bridge Co., that company being the lowest bidder.