Descriptive Geometry: With Numerous Problems and Practical Applications

Excerpt from Descriptive Geometry: With Numerous Problems and Practical Applications

The text books on Descriptive Geometry, with very few exceptions, deal only with first angle projection. But in the best recent practice in mechanical drawing, the third angle is used. The third angle is also commonly employed in perspective. It would seem to be desirable, then, not to confine the student exclusively to the use of any one angle. In this book all four angles are used. Thus the problems become general, and a large variety of constructions may be introduced under each problem.

By having the problems for construction put in a separate volume, and by having several modifications under each problem, blackboard work can be readily assigned to the members of a class in recitation, and no two students need be given exactly the same work.

If the student is required to be prepared to make the construction for each problem under all possible conditions, a thorough understanding of the problem is necessary.

A large number of carefully arranged problems and some practical applications are given.

The first few problems on the point, line, and plane are fully analyzed. Then follows a list of problems left to the student for solution. In the part of the book devoted to curves and curved surfaces, more problems are analyzed and fewer are left to the student to solve without assistance.

The importance of the study of Descriptive Geometry, both for mental discipline and on account of its industrial utility, is very ably set forth in two quotations that are given at the end of the introductory' chapter.

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