This book embodies the results of a studio experience of twenty-four years spent in practical work, in teaching, and in overcoming the everyday difficulties encountered, not alone in my own work, but in that of my pupils as well. Hence the book has been prepared with special reference to the needs of the student. It presents a brief course of precepts, and requires on the part of the pupil only perseverance in order that he may achieve excellence.

The mechanical principles are few, and have been laid down in a few words; I have given, without entering into any profound discussion of the...