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Fluid mechanics
248
BOOK NOTES
Two short chapters consider the time effects in the change of magnetization, and the disposal of the energy absorbed on going around the hysteresis loop. The book is apparently intended as an exposition of the domain theory, on a level of medium difficulty. On this level, it is excellent. Much attention is given to calculations of energies of domain arrangements, etc., but for the most complicated portions of the mathematics the reader is referred to original papers. On the other hand, the statements of the theory are constantly compared to experimental observations, without, however, exhaustively reviewing the experimental literature. It is a good survey, and should serve as an introduction to the subject for the specialist. It is rather too bad that the book is not more complete. Bozorth's tremendous "Ferromag-
[J. F. I.
netism" contains an ample survey of the work that has been done in this field, among many others. There is no need to repeat that, especially since Stewart's book, although dated three years after Bozorth's, contains little new material. W h a t is truly needed is a really detaileld treatment, in one hook, of the theory and its experimental application. The reader should be able to derive the important equations without reference to other work. and should find sufficient experimental data to judge the validity of the theory. Neither of these conditions is met in the present book. Stewart has shown a real talent for making clear the important physical concepts behind the theory. Perhaps someday he will use this hook as an outliue for the larger, more complete work this should have been. A. D. FRANKLIN
BOOK NOTES THE BRITISH JOURNAL PHOTOGRAPHIC ALMANAC 1954, edited by Arthur J. Dalladay. 32 plates, 368 pages text plus 252 pages advertising, 13 × 19 cm. London, Henry Greenwood & Co., Ltd., i954. Price, $2.00 (cardboard) ; $2.50 (cloth). Available from The British Book Centre, New York. This almanac contains material of interest to all photographers. The professionals and specialists will be benefitted by the six papers on particular aspects of photography (there is one paper on "Colonr and the Medical P h o t o g r a p h e r " ) ; all camera enthusiasts, and most laymen, will enjoy the 32 photogravure plates which illustrate what can be done with a camera. In addition to these two sections, photographers will find news of the latest equipment, formulae for use in their work, sections on materials needed for various types of photographic work, and about forty pages of miscellaneous information such as exposure tables, optical data, hyperfocal distance, copyrighting, reproduction fees, passport photographs, storage of celluloid, etc. Not the least valuable of the many features of the almanac are the 252 pages of advertisements for all types of photographic and reproduction equipment.
FLUID MECHANICS, by R. L. I)angherty and A. C. Ingersoll. Fifth edition, 472 pages, diagrams, 1 6 × 2 4 cm. New York, McGraw-Hill Book Co., Inc., 1954. Price, $7.00. The title o~ this work has been changed from Hydraulics to Fhdd Mechanics in order to emphasize that the text is concerned with all kinds of fluids, not just water. Also, the new title indicates the advance from the purely empirical approach to one based on rational principles. The text is self-contained, since it has been lengthened to include subjects ordinarily left to outside reading. Also, the text has been designed-through the use of supplementary sections in smaller type--to be used in a brief course without destroying the continuity of the subject. The junior author, whose name appears on the text for the first time, is a civil engineer. The joint efforts of the two authors (the senior author is a mechanical engineer) have resulted in a blending of the two branches of engineering which should prove helpful not only to students, but to practicing engineers.
BOOK NOTES
Two short chapters consider the time effects in the change of magnetization, and the disposal of the energy absorbed on going around the hysteresis loop. The book is apparently intended as an exposition of the domain theory, on a level of medium difficulty. On this level, it is excellent. Much attention is given to calculations of energies of domain arrangements, etc., but for the most complicated portions of the mathematics the reader is referred to original papers. On the other hand, the statements of the theory are constantly compared to experimental observations, without, however, exhaustively reviewing the experimental literature. It is a good survey, and should serve as an introduction to the subject for the specialist. It is rather too bad that the book is not more complete. Bozorth's tremendous "Ferromag-
[J. F. I.
netism" contains an ample survey of the work that has been done in this field, among many others. There is no need to repeat that, especially since Stewart's book, although dated three years after Bozorth's, contains little new material. W h a t is truly needed is a really detaileld treatment, in one hook, of the theory and its experimental application. The reader should be able to derive the important equations without reference to other work. and should find sufficient experimental data to judge the validity of the theory. Neither of these conditions is met in the present book. Stewart has shown a real talent for making clear the important physical concepts behind the theory. Perhaps someday he will use this hook as an outliue for the larger, more complete work this should have been. A. D. FRANKLIN
BOOK NOTES THE BRITISH JOURNAL PHOTOGRAPHIC ALMANAC 1954, edited by Arthur J. Dalladay. 32 plates, 368 pages text plus 252 pages advertising, 13 × 19 cm. London, Henry Greenwood & Co., Ltd., i954. Price, $2.00 (cardboard) ; $2.50 (cloth). Available from The British Book Centre, New York. This almanac contains material of interest to all photographers. The professionals and specialists will be benefitted by the six papers on particular aspects of photography (there is one paper on "Colonr and the Medical P h o t o g r a p h e r " ) ; all camera enthusiasts, and most laymen, will enjoy the 32 photogravure plates which illustrate what can be done with a camera. In addition to these two sections, photographers will find news of the latest equipment, formulae for use in their work, sections on materials needed for various types of photographic work, and about forty pages of miscellaneous information such as exposure tables, optical data, hyperfocal distance, copyrighting, reproduction fees, passport photographs, storage of celluloid, etc. Not the least valuable of the many features of the almanac are the 252 pages of advertisements for all types of photographic and reproduction equipment.
FLUID MECHANICS, by R. L. I)angherty and A. C. Ingersoll. Fifth edition, 472 pages, diagrams, 1 6 × 2 4 cm. New York, McGraw-Hill Book Co., Inc., 1954. Price, $7.00. The title o~ this work has been changed from Hydraulics to Fhdd Mechanics in order to emphasize that the text is concerned with all kinds of fluids, not just water. Also, the new title indicates the advance from the purely empirical approach to one based on rational principles. The text is self-contained, since it has been lengthened to include subjects ordinarily left to outside reading. Also, the text has been designed-through the use of supplementary sections in smaller type--to be used in a brief course without destroying the continuity of the subject. The junior author, whose name appears on the text for the first time, is a civil engineer. The joint efforts of the two authors (the senior author is a mechanical engineer) have resulted in a blending of the two branches of engineering which should prove helpful not only to students, but to practicing engineers.