PREFACE. IN order to facilitate the calculation attending the construc- tion of Wrought Iron and Steel Riveted Girders, the author has endeavored in this work to supply the linkwhich separates Theory from Practice. Its object may be briefly stated. A riveted girder is to be designed the span, depth, and loads are known, the strains are calculated b the well-known bendingmoment formulae, and largely by the graphic method lastly, the details of construction are fully illustrated. Touching the question of accuracy, it is scarcely necessary to notice the slight difference that may arise between the two methods, i.e., working out the usual formulae, or by measuring from the graphic diagrams. The time consumed in wading through a complicated series of equations to reach a few meas- urements is objectionable when at least such measurements can at once be had by the graphic method. This work does not investigate exceptional or extremely scientific riveted girders, but more especially those of...

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