From the PREFACE. The author's extensive experience in connection with pattern-making in nearly all of its variations impressed him with the belief that great benefit would be derived by many members of the craft by acquiring a more general knowledge of the business. No individual can have had the experience of many. The acquisition, then, of the knowledge of others must be gained through lectures or literature. The literature pertaining to pattern-making is by no means as extensive as the importance of the business warrants. There are many pattern-makers competent to treat the subject in a satisfactory manner, but have been deterred by the amount of time and labor necessary to do the subject justice. The subjects chosen for illustration herein are chiefly those with which the author has had personal experience and were originally written for publication in "Machinery." He also records the experience of others in pattern-making; these examples have been selected chiefly from the correspondence of the "American Machinist." He has embodied whatever in his opinion would be of interest to the pattern-making fraternity. Providing for the interior of castings, or core-box work, is correctly regarded as the most intricate and important part of pattern-making. Amongst the subjects several excellent examples of core-box work will be found. Screw propellers are a special feature, and the examples given are thoroughly elucidated. The author has always entertained a deep interest in pattern-making owing to its intricacy, the skill and intelligence required for its execution. In presenting this volume to its readers he hopes and believes it will be found a useful and desirable acquisition to the literature of pattern-making.