Excerpt from A Manual of Descriptive Geometry: With Numerous Problems Descriptive geometry gives power to express conceptions and to solve problems in the constructive arts; it also effectively disciplines the geometrical imagination. To accomplish these ends, thing is better than problems of progressive difficulty, which, taken in their logical order, the student can master alone, or with the aid of a small amount of judicious suggestion, and this principle has controlled the plan of this book. Part I., therefore, consists exclusively of problems systematically arranged. The Introduction should be read before the student undertakes to solve these, as it is t intended for recitation, but for a preparatory lecture and for reference. It is t expected that any student will solve all the problems, r would it be a wise expenditure of time. A course has been laid down, - by means a minimum one, - and in Part II. of the book, suggestions, analyses, and occasional demonstrations for the solution of the problems of this course have been given, with the intention, however, of always leaving some real work for the student. A large number of additional problems have been stated, which can be substituted at will for the others or can be used independently. Such combinations of the problems can be readily formed that the instructor may have from year to year the substantial advantages of a change of text-book. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art techlogy to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.