# Minutes of proceedings of the Institution of Civil Engineers Volume 74, pt. 4

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1883 Excerpt: ...are dealt with from both abutments to the centre, as in Fig. 8. The Author believes that in the foregoing examples, by following out in detail each polygon, and connecting the skeleton trusses with them by the notation adopted, he has, if not adding anything new to the graphic theory itself, helped to make it more intelligible to those who wish to understand its practical use. The Paper is illustrated by several diagrams, from which Plates 8 and 9 have been prepared. Paper No. 1918.) "Continuous Girder Bridges." By Thomas Claxton Fidler, M. Inst. C.E. In applying mathematical theory to the solution of the various questions which arise in the work of designing iron bridges, it is a matter of no small importance to select such a method of calculation as will exhibit within the smallest possible compass the whole conditions of the problem and process of its solution, and will at the same time present the required results in a simple and manageable form. In these respects, the advantages offered by the Graphic or Geometric methods are very great, although perhaps the facility of adaptation which these methods possess may not be so readily appreciated by the mathematician as they are by the engineer or draughtsman who employs them as instruments in working out the elements and details of his design. In the case, especially, of Continuous Girder Bridges, the formulas deduced by analytical theory are so complex that any simple geometrical solution of the problem, even if less elegant or less rigorously exact, would probably be preferred by most practical men as being far more serviceable for their purposes. The complexity of the theory in this case arises from the fact that when the girder is supported at more than two points, the upward reaction of the ...

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