الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Gear-Design trends: Gears are used in most types of machinery. Like nuts and bolts they are a common machine element which will be needed from time to time by almost all machine designers. Gear design has become a highly complicated art. The constant pressure to build less expensive, quitter runnung, lighter-weight, and more powerful machinery has resulted in a steady improvement of gear designs. At present much is known about gear load-carrying capacity and many complicated processes are available to make gears. Several large compaines are running fulltime gear test and development programs. Each year new ways are found to make gears at lower cost and yet make gears which will run better and carry more load. Many machine designers do not have the time to keep up with all the developments in the field of gear design. This makes it hard for them to quickly design gears which will be competitive with the best that are begin used in their field. There is a great need for practical gear-design information. Even thought there is a wilth of published information on gears, the gear designer often finds it hard to quickly locate information he needs.