This volume is not intended primarily for the mature pattern-maker, although the authors hope the masters of the craft may read it with pleasure if not with great profit. It is planned to outline to the younger members of the fraternity a general survey of the most suitable materials, the special tools, and the fundamental processes of the trade, together with the relations of the allied depart ments, particularly those of the foundry. The detailed construction of typical patterns has been treated in an excellent manner by very competent workmen in the several books now published, and still the literature of the craft is not as large as the importance of the subject would seem to warrant. This book is not intended to supplant any of the existing works, but rather to pave the way for a better understanding of their technical excellencies. If it aecom plishes this result even in a small way the authors Will be well content.