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เนื้อหาย่อ : Known in practically every part of the world as the transformer engineer's *bible', The J & P Transformer Book is the leading treatise on the power trans- former and is an essential reference book for engineers concerned with the design, installation and maintenance of power transformers. It is invaluable as textbook for the architect and system planner as well as for the electrical engineering graduate and the student. The book started as a series of pamphlets published by Johnson and Phillips Ltd. in 1922 entitled Transformer Abstracts, and an immediate and increasing demand led to extensive reprinting, until in 1924 it was decided to publish the work as a single volume. The first edition of The J & P Transformer Book appeared in January 1925 and this was quickly followed by a second edition in August of the same year. The continuing interest of engineers and the favourable reviews of the electrical press necessitated further editions from 1928 until the appearance of the eighth edition in 1941. A scarcity of printing materials during and immediately after World War II, and the retirement of Mr. H. Morgan Lacey who was one of the original authors, led to the book being allowed to go out of print, although the demand for it continued. In 1958, work on the ninth edition commenced with Mr. A. C. Franklin, at that time Chief Designer at Johnson & Phillips Ltd, as co-author with Mr. S. A. Stigant. This edition was published in 1961 and a revised impression appeared in 1965. This is the tenth edition and it is almost entirely the work of Stigant and Franklin, although credit has been given by the authors to the past work of H. Morgan Lacey in the acknowledgements. It is now published by Butterworths, and represents a very considerable amount of research and study on the part of the authors in respect of the data supplied by transformer manu- facturers and allied industries together with that made available by relevant institutions and associations. It contains a wealth of new technical information with tables, calculations, diagrams, line drawings and pictorial illustrations. onversion to S.I. units has been undertaken and the whole book has been reset and repaginated. The information contained herein will prove even more useful to engineers than that contained in past editions.