Engineering As A Career

Overview

This is an EXACT reproduction of a book published before 1923. This IS NOT an OCR'd book with strange characters, introduced typographical errors, and jumbled words. This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant marks, etc. that were either part of the original artifact, or were introduced by the scanning process. We believe this work is culturally important, and despite the imperfections, have elected to bring it back into print as part of our continuing ...
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Overview

This is an EXACT reproduction of a book published before 1923. This IS NOT an OCR'd book with strange characters, introduced typographical errors, and jumbled words. This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant marks, etc. that were either part of the original artifact, or were introduced by the scanning process. We believe this work is culturally important, and despite the imperfections, have elected to bring it back into print as part of our continuing commitment to the preservation of printed works worldwide. We appreciate your understanding of the imperfections in the preservation process, and hope you enjoy this valuable book.
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Product Details

  • ISBN-13: 9781146628532
  • Publisher: Nabu Press
  • Publication date: 3/5/2010
  • Pages: 242
  • Product dimensions: 7.44 (w) x 9.69 (h) x 0.51 (d)

Read an Excerpt


ing earthwork that is worth twenty-five cents per cubic yard, he uses an ordinary tape line, which he knows will not give a high degree of precision to the results. This is because the irregularities of the ground surface are such that with a more perfect tape the results would be no better. In measuring a smooth brick pavement worth about three dollars per square yard, he uses a steel tape and gets a much closer result. It is always his aim to adjust the precision of his work to the needs of the case. The timber of a railway trestle is measured sometimes to the nearest sixteenth of an inch, but fine machined steel is frequently calipered to the nearest thousandth of an inch. SAFETY. In calculating the strength of a structure it is obvious, if one will but think, that the load must be an assumed average, that the actual strength of the material varies considerably with its nature and quality, and that the resulting design, to be safe, must be calculated from liberal values. This gives rise to a technical term called the factor of safety, and it is commonly talked among laymen that the average factor of safety is four. That is, in their thought, a structure safely designed and built will carry four times the load for which it is planned. This is one of the most pernicious notions the engineer must combat. If he knew to a pound the weight of a load and if he knew to a pound the strength of his material, he could build a supportthat would carry the load, but fail, perhaps, with the addition of another pound. But he never knows these things so precisely; and with the knowledge which he has, it is his function to design safe structures, making use of the judgment derived from experienceas a substitute for facts that cannot be known. If the engineer says that he has used a factor...
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