The author's principal object in writing this book was not to put  forward any particular method of construction, but to collect in a  concise form what seemed to him best of the many formulae and systems  used in various countries, and to deal with the subject in such a manner  as to be intelligible to average students of architecture who have not  been required to devote that amount of study to the theory of  construction which is demanded of the young engineer


 
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