My aim in writing this book has been twofold: to provide a school textbook which shall contain all that is necessary for the Army examinations, and be an introduction to the Mechanical Drawing of Engineers; and to place Geometrical Drawing on a more sure basis as a study of great educational value. The teaching of Geometrical Drawing is often relegated to the Drawing Master, who might as reasonably be expected to teach Euclid; for it is distinctly a branch of Mathematics, many of the problems requiring considerable geometrical skill in their solution.