Excerpt from Structural Engineering
The author does not profess in this work to treat the subject of Structural Engineering from a historical point of view, which he considers rather interferes with the continuity of the subject from a student's standpoint, and he may at once disclaim the possibility of introducing any very novel methods of presenting it. He considers, however, that certain aspects of the subject, for example, the methods of the equilibrium polygon and of the ellipse of stress, do not generally receive that attention to which their utility and reliability entitle them, and he has endeavoured to give them due prominence. He is also of the opinion that there is a want of a text book, suitable for students of Engineering, intermediate between what is generally called Strength of Materials and such specialised works as, for instance, Claxton Fidler's "Bridge Construction" or Merriman and Jacoby's "Roofs and Bridges." He has endeavoured to place before the student of the subject, in a consecutive and intelligible manner, the principal ideas and methods which underlie the investigations necessary in the design of structures. In most engineering problems it is not possible to make hypothetical assumptions, which, converted into mathematical equations, are a pure expression of the actual data of a problem of design, consequently mathematics have generally to be applied in detail to each part of a problem and the assumptions readjusted at each step to prevent the mathematical deductions diverging to any considerable extent from the actual conditions of the problem.
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