. Railway track and track work . Illbet. Blocks ^ -JO- Half Side Elevation. Cross Half 29.—Kimballs Concrete Tie. concrete is composed of 1 part of cement, J sand, and 2 of 15-in. stone; or1 cement to 2h gravel. The weight is 436 lbs.: concrete, 374 lbs.; metal,52 lbs.; wood, 10 lbs. Relative Economy of Wood, Steel and Concrete Ties. The results of an investigation made by Mr. W. C. Cushing, PennsylvaniaLines, as to the relative cost and economy of various kinds of ties are con-densed and tabulated in Table No. 3. The first series of columns (A) show, forinstance, that with
. Railway track and track work . Illbet. Blocks ^ -JO- Half Side Elevation. Cross Half 29.—Kimballs Concrete Tie. concrete is composed of 1 part of cement, J sand, and 2 of 15-in. stone; or1 cement to 2h gravel. The weight is 436 lbs.: concrete, 374 lbs.; metal,52 lbs.; wood, 10 lbs. Relative Economy of Wood, Steel and Concrete Ties. The results of an investigation made by Mr. W. C. Cushing, PennsylvaniaLines, as to the relative cost and economy of various kinds of ties are con-densed and tabulated in Table No. 3. The first series of columns (A) show, forinstance, that with white-oak ties costing 70 cts. and giving a life of 10 years,only 20 cts. can be paid for a tie of inferior wooil treated with the zinc-tanninprocess and lasting 14 years; only $ can be paid for a steel tie lasting 20years. The second series of these columns (B) shows the price which a white-oak tie (10 years life) must reach before it will be economical to use any of theothers. Thus with oak at 70 cts., it is economical to buy inferior woods at 46cts. and treat them by the zinc-
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