The Elements of Machine Design (Classic Reprint)

The Third Science is that of Machine Design. This has been removed by Redtenbacher from its incorrect position as a part of Applied Mechanics, and established on a footing of its own. I ts province is to show how the parts of the machine are to be proportioned so as tp resist deformation. In order to accomplish this fully, they must be considered both with reference to the external forces acting on the machine, and the corresponding molecular forces within its substance. The former are assumed as determined by theoretical mechanics (for example, the steam pressure upon a piston, or the water pressure on the vanes of a turbine) ;these define the requirements of the parts as to strength. The latter, the molecular forces, transmit the force action from part to part (for example, from the piston rod to the connecting rod, or from toothed wheel to toothed wheel), and cause also friction and wear. The science of Machine Design applies the results of research in these two directions to the special problems with which it deals. When it solves these problems in accordance with technological requirements, it foims a really technical science. Reuleaux, Theoretische Ktnefnatik.
(Typographical errors above are due to OCR software and don't occur in the book.)

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