ar on the points a being used in the joints. separate, it becomes necessary to consider the well-known @and a, Upon these two arched ribs, which are firmly connect- fact (and its effect ed with each other by cast iron tubular crossbraces and on the combina- 7 heavy wrought diagonal ties, is erected… … part having the tion, by which the traffic between the cities of Washing- least depth, and ton and Georgetown is carried over, the water of the to toat part oearmg vetween these two points, their sum which is most flexible, will bend away from the load Washington Aqueduct is conveyed into the city…
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