From the PREFACE.
Having in charge the preparation of all of the engineering students in Purdue University in Mechanical Drawing for their Course in Engineering Design, the writer has compiled a series of progressive notes on the subject calculated to impart a working knowledge of the principles of graphic representation, and offering such examples as will acquaint the student with the conventions of the art. The work is divided into two parts, Part I being "A Course in Elementary Mechanical Drawing," administered in the Freshman year, and Part II a course in "Advanced Mechanical Drawing," administered in the Sophomore year as a course in drawing, and in connection with the classroom and lecture work in Descriptive Geometry.
The work is purely elementary, dealing with methods of representation alone, manipulations of construction, and does not treat of Design, being preliminary to that subject.
This part, Advanced Drawing, is offered to students and draughtsmen who have a working knowledge of the principles of the art, such as is offered in Part I, and who have, also, some knowledge of the principles of Descriptive Geometry.
The discussions have been made as brief as was thought consistent with clearness, and are intended simply to suggest such lines of thought as will render the figures, the illustrations— an engineer's "description" — self-explanatory.
In selecting a "Course in Drawing" from the examples offered, it is suggested that, in so far as possible, the Practical Problems be made to follow the Theoretical Problems delineating the principle involved; such an arrangement, for example, as is given by Plate 27, page 177.
