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text on "Sheet Metal Drafting" was prepared especially for correspondence-study instruction in the Extension Division of the University of Wisconsin. It is also admirably adapted as a text book for Vocational, Evening, and Part-time Schools.

The underlying principles of sheet metal pattern drafting are presented, each chapter discussing a different principle. The sequence of principles has been arranged with due regard to the well-known factors governing the student's progress through such a course of instruction. This arrangement has been successfully tested by several years of practical application in the teaching of the subject.

The problems in "Related Mathematics" point out the applications of mathematical principles to sheet metal work and serve as a guide for the proper correlation of the work in mathematics, drawing, and shop practice.

When the text is used for vocational, evening, and part-time schools, the articles considered in the various chapters can be manufactured in the shop school. When these are sold, the cost of instruction is considerably reduced without sacrificing the educational value of the course.

Acknowledgments are due Ben G. Elliott, M. E., Professor of Mechanical Engineering, University of Wisconsin, for his suggestions as to the general form and content of the text, and valuable editorial work. 2em February, 1921.