. Railroad structures and estimates . RIDGES. Length Style oftruss. Height. of truss. No. ofpanels. Total dead and live load per ft. Estimated quantities. Approxi- ofspan. Timber,ft. B. M. Wroughtiron. Castiron. mate costerected. Ft. 30 40 50 60 70 80 90 90 100 110 120 130 140 150 446678989 1011121314 60005500520049004800480048004800480048004800470047004700 10,20013,40019,10022,80030,00035,40042,80041,90048,90054,80062,10070,20078,20086,700 Lbs. 2,200 3,000
. Railroad structures and estimates . RIDGES. Length Style oftruss. Height. of truss. No. ofpanels. Total dead and live load per ft. Estimated quantities. Approxi- ofspan. Timber,ft. B. M. Wroughtiron. Castiron. mate costerected. Ft. 30 40 50 60 70 80 90 90 100 110 120 130 140 150 446678989 1011121314 60005500520049004800480048004800480048004800470047004700 10,20013,40019,10022,80030,00035,40042,80041,90048,90054,80062,10070,20078,20086,700 Lbs. 2,200 3,000 5,700 6,800 17,500 22,000 28,700 33,100 41,600 48,200 56,900 67,300 73,900 87,300 Lbs. 1,000 1,300 2,900 3,700 8,300 10,000 12,600 13,300 14,300 16,000 18,300 20,900 23,300 27,100 Prices assumed : Timber, $35 per M. ft. B. M. erected; steel, 5 cts. per pound erected;cast iron, 4 cts per pound erected. Supervision and contingencies, 10%. 72 RAILROAD STRUCTURES AND
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