. Engineering and Contracting . 4 | B-2 85 G« 8 12 in. B-2 85 6 X 8 12 in. C-1 85 G X 8 12 In. OJG C-2 85 6x 8 12 In. 0J4 TotilLood-loooooib. I i ljl_iljljuuljljlJu K 125 G X 8 24 In. Cinder 85 G X 8 , loos 0A± 0^10^ OJJT^ distribution to bearing pressures along its bed. Of these thelast bears the most important relation to the problems he
. Engineering and Contracting . 4 | B-2 85 G« 8 12 in. B-2 85 6 X 8 12 in. C-1 85 G X 8 12 In. OJG C-2 85 6x 8 12 In. 0J4 TotilLood-loooooib. I i ljl_iljljuuljljlJu K 125 G X 8 24 In. Cinder 85 G X 8 , loos 0A± 0^10^ OJJT^ distribution to bearing pressures along its bed. Of these thelast bears the most important relation to the problems hereconsidered; the others will not be treated at this time. The cross-tie has many features which make it an accept-able part of ordinary track construction. It has great flexibilityin meeting the varied and divers requirements of both ordinaryand unexpected track and load conditions. It gives facility inproviding, maintaining, or shifting the gauge, line and surfaceof track and in tie renewals and other changes in track, tind. Fig. ^—Track Depression Profile on Illinois Central R., R. is accepted as an economical and reliable element of ordinarytrack construction. It is known to be effective under veryimperfect track conditions, being used where great variationof size and quality of tie, depth and quality of ballast, andcondition of tamping of track may be expected to causemarked differences in the requirements put upon it. Quanti-tative data on the flexural action of the tie and the way itsloads are distributed along its bed, as well as of its depres-sions under load, therefore should be of considerable Talue. Method of Testing Depression and Flexure and BearingPressure of Cross-Ties.—In measuring the depression and flex-ure of the ties a stiff wooden reference bar was placed underthe rails between ties and close to the one on which measure-ments were taken. At each end of this bar was attached aniron cross-bar about 2 ft. long, the ends of which rested ontwo substantial
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherchicago, bookyear19
