८ 33 By Exchange COPYRIGHT, BY D. VAN NOSTRAND. STEREOTYPED AND PRINTED NATIONAL PRINTING CO., NEW YORK. :, PREFACE. THE object of this book is to impart a knowledge of Pattern Making that shall be useful to apprentice Pattern Makers, and also to practical machinists, because the drawings of the designer do not as a rule give any instructions as to the construction of the patterns, while at the same time that construction may affect to a considerable degree, the manipulations of the machinist. Furthermore, it often occurs in the experience of a general machinist, that he is required to make a pattern either in iron or wood, and the complete isolation which usually exists between the pattern shop and the machine shop, is an effective bar to the acquisition of knowledge by observation. The information is given from actual pattern shop prac tice, and in the ordinary workshop parlance. The tables have been selected with a view to a collection comprising all that the Pattern Maker of the widest experience requires; arranged for his convenience, although in as compact a form as possible. |