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เนื้อหาย่อ : PREFACE In 1960 the book Techniques of Non-Destructive Testing, edited by C. A. Hogarth and myself and published by Butterworths, made its appearance. It contained short and concise contributions from different authors, including W. G. King and J. C. Rockley, on the isotope, various non-destructive testing techniques such as x-ray, ultrasonic, eddy current, magnetic particle, and penetrant methods. That book is now out of print and the preparation of a second edition has been made difficult because some of the authors are no longer available. In the meantime, however, Butterworths have published Rockley's An Introduction to Industrial Radiology, dealing with x-ray and isotope methods, and the English translation of UItrasonic Methods of Testing Materials by L. Filipczynski, Z. Pawlowski, and J. Wehr, which I edited. The publication of Electrical, Magnetic, and Visual Methods of Testing Materials thus completes a three-volume series covering the conventional methods of non-destructive testing in a more compre- hensive manner than the original single volume. This present work concentrates mainly on eddy current, magnetic particle, and penetrant methods of testing but it also deals with a number of other electrical, magnetic, and optical techniques, in rather less detail. Brief descriptions are given of one or two of the latest developments in non-destructive testing, including holography and the use of microwaves. Advantage has been taken of the wealth of experience built up over many years by Messrs. King and Rogers in magnetic and penetrant methods by providing detailed descriptions of the correct procedure for these techniques and pointing out the many pitfalls which the inexperienced and unwary operators are likely to meet. The application of these methods must be regarded as more of an art in comparison with those of eddy currents, for which the operator can rely on the use of modern electronic equipment. Even so, details of the procedure with the Magnatest Q, a typical eddy current device, for the testing of small components are provided. These are given in an Appendix to this book in order to preserve the balance in Chapter 2. It had been hoped to give fuller details of the pro- cedure with other eddy current methods, in the light of practical experience gained by the authors, but this was not possible in view of internal security regulations.