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The Elements of Graphical Statics and Their Application to Framed Structures: With Numerous Practical Examples of Cranes--bridge, Roof and Suspension Trusses--braced and Stone Arches--pivot and Draw Spans--continuous Girders, &c., Together with the Best Methods of Calculation, and Containing Also New and Practical Formulae for the Pivot Or Draw Span--braced Arch--continous Girder, Etc