Besides the well-known earlier methods of rotating-disk calculations such as those developed by Grammel and others, an extensive treatment is given of more recently developed procedures including difference methods and those which involve the division of the disk profile into a number of conical-shaped segments, which are then fitted together. Since the author limits himself mainly to elastic conditions, very little information is given on such important practical subjects as the effects of plastic flow, creep, and fracture. In spite of this limitation, the book nevertheless should be of considerable interest and value to research men and designers.

Overall, findings underscore the heterogeneity and complexity of transition patterns for a subgroup historically treated as likely to decline or remain stable, and viewed as "permanent" residents. The model was useful in describing the volatile transition process among older long-stayers.