The authors wish to thank the following persons and companies who have assisted in the successful completion of this book: Mr. F. E. Masselin, for assistance with the chapter on “Modeling and Casting”; Metal Crafts Supply Company, Providence, Rhode Island, for the illustrations of tools and equipment; Dumore Company, Racine, Wisconsin, for the illustration of a high-speed precision drill on page 146; G. & C. Merriam Company, Springfield, Mass., for technical definitions of styles of stone cutting on pages 4 and 5; Rhode Island School of Design for the use of their facilities in developing the work treated in this book; and former students whose drawings and designs are reproduced.