Prism and Lens Making: A Textbook for Optical Glassworkers, Second Edition is a unique compendium of the art and science of the optical working of glass for the production of mirrors, lenses, and prisms. Incorporating minor corrections and a foreword by Professor Walter Welford FRS, this reissue of the 1957 edition provides a wealth of technical information and hands-on guidance gained from a lifetime of experience. Although some of the techniques have been replaced by more modern methods, this classic book is still a valuable source of practical assistance as well as being a pleasure to read. About the Author Frank Twyman was a skilled craftsman in all aspects of optics. He joined Otto Hilger in 1898 to work on the production of simple spectroscopes costing less than £10 each. After the death of Otto Hilger, Twyman became Managing Director of Adam Hilger Ltd., a company known for the finest quality optical and mechanical work. He worked here from 1902 to 1946 and was very concerned with the practical aspects of instrument making; he designed many of the instruments himself and constantly strove to improve the techniques of optical grinding and polishing. In 1916 Twyman and Alfred Green, the foreman of the Hilger optical shops, patented the now-famous prism and lens testing interferometer that bears their names. Twyman also undertook fundamental studies in the annealing process for glass and invented new spectrophotometers and spectrographs.

Prism and Lens Making: A Textbook for Optical Glassworkers, Second Edition is a unique compendium of the art and science of the optical working of glass for the production of mirrors, lenses, and prisms. Incorporating minor corrections and a foreword by Professor Walter Welford FRS, this reissue of the 1957 edition provides a wealth of technical information and hands-on guidance gained from a lifetime of experience. Although some of the techniques have been replaced by more modern methods, this classic book is still a valuable source of practical assistance as well as being a pleasure to read.

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There are many books available covering the Training Within Industry (TWI) programs, but few include any unique material on adaptation or modification – This dearth of new has caused practitioners to alter the programs without understanding the underlying principles. These changes have made the programs less effective. One must, however, maintain the principles used in the programs when changing the delivery of the programs to suit the culture. The purpose of The TWI Facilitator's Guide: How to Use the TWI Programs Successfully is to prevent the TWI programs from falling into misuse and disuse. This book will explain the main principles of the TWI programs and what they can accomplish, but it will also stress what they are not. This book reviews what the programs are and then explains how to use them. It tells why we do certain aspects of each program. When we know why we do something, we won’t stop doing it for the wrong reason.

Reprint of the 1945 edition with footnotes and addition of the TWI activities after 1945.