port for the ballast, troughs made ofmild steel were used and either laid longitudinally or trans-versely according to the height available for construction. -6- Figure 3 /* •//• •/ • • • • • • • • 1 ° °^/*J*/%* */ 0J3 On O O 0/» I/O O OO o C , Oo0o0o0o0o°o0o0o0o°o0o0 o ° o °^ ooA •//* */o o o o o… … * * 0 » • • - -7- The least height is occupied by the bridge with ballast betweenthe girders as shown in figure 6, page 8. The troughs areplaced longitudinally and rest on flat straps of iron, twentyfive-thirty seconds of an inch high, and about two inches widefastened to the tops of the floor…
Bridges · Theses
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