If you stick to just the free features, however, you can still do some editing to the file and save it back to your computer. The book could easily be expanded to fill a five volume set. If you use a non-free feature, the PDF will save with a watermark on every page. Note the slide rule disclaimer on page A13.13, column 2: “The calculations in this example being done on a slide rule cannot provide exact checks.” The examples in “Bruhn” are condensed. Keep in mind that “Bruhn” was written before electronic calculators and spreadsheets were invented.
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This book is a compilation of the mistakes, omissions and typographical errors my teammates and I have discovered in the last two decades. PDFLight for Mac OS X puts an end to all of this Whether it is a multi page business report, sophisticated corporate presentation or your resume, the size savings achieved through PDFLight and the ultra fast, high quality display of graphics and text even on tablets and smart phones are equally impressive. While some of the methods are more than fifty years old, the lessons are timeless. You won't find many aircraft stress analysts using the Moment Distribution (Hardy Cross) Method, Slope Deflection Method or the Methods of Elastic Weights, Dummy Unit-Loads, Moment Areas, Virtual Work or Influence Coefficients. While many of the methods in “Bruhn” have been overshadowed by Finite Element Analysis, they provide valuable insight into the fundamentals of aircraft design and an appreciation for the men and women that designed aircraft before John Vincent Atanasoff and Clifford Berry invented the electronic digital computer at Iowa State University.
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