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Extensive air showers
354
BOOK
The series, a joint project of the Office of Naval Research and Applied IlJechanics Reviews, is a welcome addition to the mathemaThe bibliographies are exceltician’s library. lent, the authors are unquestioned authorities, and the subjects are timely. THE EARTH AND ITS GRAVITY FIELD, by 1!:.
A. Heiskanen and F. A. Vening Meinesz. 470 pages, diagrams, 6 X 9 in. New York, Price, McGraw-Hill Book Co., Inc., 1958. $12.50. The newest of the McGraw-Hill Series in the Geological Sciences, this volume will be of value to advanced graduate students in the geophysical sciences. The authors ate both outstanding men in geodesy; their combined work on the timely subject of the Earth’s gravity field is a significant contribution to science. In addition to covering developments in the first half of the Twentieth Century, the authors have arrived at important new conclusions concerning the Earth’s equilibrium, and about deviations from this equilibrium. The study of gravity fields is of global importance; this book is the most authoritative and complete one in this important field. Among the topics covered are : spherical harmonics; a discussion of how, by obtaining enough gravity-field data, the figure of the Earth and the shape of the geoid can be determined; descriptions of the apparatuses used in measuring gravity; isostasy, its history and main systems; existing geodetic systems and the possibility of converting these into one world geodetic system through extensive gravity measurements; polar migrations and their effects on the Earth’s crust ; geosynchine belts ; tilted fault planes. Several geodetic maps (two of the Indonesian Archipelago are large ittserts), tables of data and graphs add to the presentation. PROCESSING OF THERMOPLASTIC MATERI;\LS, 690 pages, edited by Robert C. Rernhardt. illustrations, 6 X 9 in. New York, ReinPrice, $18.00. hold Publishing Corp., 1959. This is the second contribution in the Plastics Engineering Series, sponsored by the Society of Plastics Engineers. The volume covers extrusion, injection tnolding, calendering and other processing operations for thermoplastic materials. The twenty contributors are experts in their fields. The book is di-
1J. F. I.
NOTES
vided into three sections. The first section deals with fundamentals, such as flow behavior, heat transfer, mixing and dispersion, The second section-about half the bookcovers applications (extrusion, injection molding, calendering, mixing and dispersing processes, sheet forming, forming of hollowarticles, sealing and welding). Processing properties are treated in the third section, for acrylic, cellulosic, nylon, polyethylene, styrene and vinyl resins. This final section is composed largely of flow charts of processing data, comThese represent piled by materials suppliers. the most complete and up-to-date data available, although the author points out that there are still many “gaps”. AIR SHOWLRS, by \\‘. Galbraith. 211 pages, diagrams, .5$ X 8; in. London, Butterworths Publications, Ltd. ; New York, Price, $7.50. Academic Press Inc. ; 1958.
EXTENSIVE
Dr. Galbraith, of the United Kingdom A4toniic Energy Research Establishment, has prepared this monograph for physics students, both graduate and undergraduate, who want to know what has happened in this field since the discovery of the phenomenon of extensive air showers. The book is divided into eight Each chapchapters, with an I ntrodrtrtion. ter covers roughly one aspect of the work. Both theoretical and experimental results are discussed. The eight main topics are: development of an extensive air shower (photonelectron cascade theory, nuclean cascade, lateral spread) ; lateral density distribution of electrons (near shower axis and far from it, multiple cores, momentum spectrum) ; longitudinal development of air showers (effect of tetnperature periments; sive
air
produced. those
up
and altitude) time variations
showers The through
; underground
; and Cerenkov list
of
tx-
in the rate of extenreferences
radiation includes
1957, with a few in 1958.
THE CHEMISTRY A&DTECH~OI.O~~ OF Lis.a~HKR VOLUME 2. TYPES OF TANNAGI
BOOK
The series, a joint project of the Office of Naval Research and Applied IlJechanics Reviews, is a welcome addition to the mathemaThe bibliographies are exceltician’s library. lent, the authors are unquestioned authorities, and the subjects are timely. THE EARTH AND ITS GRAVITY FIELD, by 1!:.
A. Heiskanen and F. A. Vening Meinesz. 470 pages, diagrams, 6 X 9 in. New York, Price, McGraw-Hill Book Co., Inc., 1958. $12.50. The newest of the McGraw-Hill Series in the Geological Sciences, this volume will be of value to advanced graduate students in the geophysical sciences. The authors ate both outstanding men in geodesy; their combined work on the timely subject of the Earth’s gravity field is a significant contribution to science. In addition to covering developments in the first half of the Twentieth Century, the authors have arrived at important new conclusions concerning the Earth’s equilibrium, and about deviations from this equilibrium. The study of gravity fields is of global importance; this book is the most authoritative and complete one in this important field. Among the topics covered are : spherical harmonics; a discussion of how, by obtaining enough gravity-field data, the figure of the Earth and the shape of the geoid can be determined; descriptions of the apparatuses used in measuring gravity; isostasy, its history and main systems; existing geodetic systems and the possibility of converting these into one world geodetic system through extensive gravity measurements; polar migrations and their effects on the Earth’s crust ; geosynchine belts ; tilted fault planes. Several geodetic maps (two of the Indonesian Archipelago are large ittserts), tables of data and graphs add to the presentation. PROCESSING OF THERMOPLASTIC MATERI;\LS, 690 pages, edited by Robert C. Rernhardt. illustrations, 6 X 9 in. New York, ReinPrice, $18.00. hold Publishing Corp., 1959. This is the second contribution in the Plastics Engineering Series, sponsored by the Society of Plastics Engineers. The volume covers extrusion, injection tnolding, calendering and other processing operations for thermoplastic materials. The twenty contributors are experts in their fields. The book is di-
1J. F. I.
NOTES
vided into three sections. The first section deals with fundamentals, such as flow behavior, heat transfer, mixing and dispersion, The second section-about half the bookcovers applications (extrusion, injection molding, calendering, mixing and dispersing processes, sheet forming, forming of hollowarticles, sealing and welding). Processing properties are treated in the third section, for acrylic, cellulosic, nylon, polyethylene, styrene and vinyl resins. This final section is composed largely of flow charts of processing data, comThese represent piled by materials suppliers. the most complete and up-to-date data available, although the author points out that there are still many “gaps”. AIR SHOWLRS, by \\‘. Galbraith. 211 pages, diagrams, .5$ X 8; in. London, Butterworths Publications, Ltd. ; New York, Price, $7.50. Academic Press Inc. ; 1958.
EXTENSIVE
Dr. Galbraith, of the United Kingdom A4toniic Energy Research Establishment, has prepared this monograph for physics students, both graduate and undergraduate, who want to know what has happened in this field since the discovery of the phenomenon of extensive air showers. The book is divided into eight Each chapchapters, with an I ntrodrtrtion. ter covers roughly one aspect of the work. Both theoretical and experimental results are discussed. The eight main topics are: development of an extensive air shower (photonelectron cascade theory, nuclean cascade, lateral spread) ; lateral density distribution of electrons (near shower axis and far from it, multiple cores, momentum spectrum) ; longitudinal development of air showers (effect of tetnperature periments; sive
air
produced. those
up
and altitude) time variations
showers The through
; underground
; and Cerenkov list
of
tx-
in the rate of extenreferences
radiation includes
1957, with a few in 1958.
THE CHEMISTRY A&DTECH~OI.O~~ OF Lis.a~HKR VOLUME 2. TYPES OF TANNAGI