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เนื้อหาย่อ : Blueprints are the guideposts of industry. By their use, both simple and com- plex parts and mechanisms may be described graphically with such completeness that one part, or any number of the same part, may be manufactured to the specified size, shape and degree of accuracy. The blueprint points the way at each stage of production from the time an original idea is conceived until the product is completed. were possible to accumulate all blueprints over a long period of ye would furnish an accurate inventory of manufactured articles and the newer experi- mental projects. These, in turn, would become a partial historical record of man's achievements and civilization's progress. They would tell another story, too, about inter-country dependence and coopera- tion, since the blueprint is the universal language of craftsmen. While languages and systems of measurement vary among the various countries of the world, certain drafting techniques are recognized as standard. Thus, it is possible for craftsmen, who can interpret drawings, to produce identical parts even though they work in different lands. This universal language forms the foundation for the production of interchangeable parts. Because techniques of representation differ with manufacturers, careful analyses of drafting room practices and occupational studies were made to determine the blue- print reading needs of skilled and semi-skilled workers. These comparative studies of training needs gave direction and emphasized the degree of thoroughness with each instructional unit had to be organized and The scope of instructional units in this book is sufficiently broad to insure com- plete mastery in blueprint reading and to cover the range of drawings, sketches and prints which mechanics are normally required to read and to interpret accurately. The individual units incorporate many of the newer tested teaching-learning methods ulum development practices which both writers have used s under actual conditions. Grateful acknowledgment is made to Elmer A. Rotmans, Head of the Drafting Department, Edison Technical and Industrial High School, Rochester, for the skill- reparation of the drawings; and to Peter J. Olivo, Associate Directo culum Research, Delmar Publishers, Inc., for the preparation of final manuscript for publication.