. Railway age . hegeneral principles of hydraulita. For this subject, only the methodsof preparing the tables are given, and it will be necessary for theengineer to make himself perfectly familiar with these methods andback this with a further knowledge of hydraulics beforethe tables can be successfully used. This can only l)e accomplishedby a careful study of the development of the formulas and theirresults from the start, and when this has been done the tables anddiagrams will be found to be in such form that the determinationsof size and capacity of the piping to be used will b
. Railway age . hegeneral principles of hydraulita. For this subject, only the methodsof preparing the tables are given, and it will be necessary for theengineer to make himself perfectly familiar with these methods andback this with a further knowledge of hydraulics beforethe tables can be successfully used. This can only l)e accomplishedby a careful study of the development of the formulas and theirresults from the start, and when this has been done the tables anddiagrams will be found to be in such form that the determinationsof size and capacity of the piping to be used will bo rapidly made. CONTRIBUTIONS The Harreli Reinforced Concrete Tie. .May 71 li. TIIK EdITOK ok TlIK ; in the editorial on Metal and Reinforced Concrete Ties In yourissue of May 1 you say there were 30 Harreli perforated verticalcenter-plate composite ties put In the Pennsylvania main line tracknear Harrison street. Chicago, in 1899. You state that they were all /fa/ CMair. Early Harreli Tie. removed within a year because the fastening was too weak; alsothat some of the ties were badly broken, and it did not appear thatthe design could be used for heavy trafflc. You were misiufornied regarding the design of tie used. Isend you herewith a sketch of the reinforcement used In that ties failed because of the weakness of the rail chair attach-ment, the lightness of the bolts used for clamping the rails and
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