PHOTOGRAPHY HELPS A COSMOTRON KEEP PROTONS IN LINE

A peak power of 21,000 KVA will create the mag-netic field in the cosmotron now under constructionat Brookhaven National Laboratory. The design callsfor whirling protons through the field of a giantdoughnut-shaped magnet, over 60 feet in diameter.At every point of the protons' path along the circularquadrants and at all times during the second while themagnetic field is rising to its top value, the configura-tion of this field must be the same, or the protons willcollide with the walls and be lost.This monster magnet is built of laminations of 1/2"

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block were displayed on a cathode-ray oscillographand photographed with a Kodak 35 camera. Fivemonths and 8,000 oscillograms later (the shutterdidn't fail once), a complete set of photographs likethose seen here of the characteristics of each blockmade it possible to determine the position of each onein the magnet ring, to insure the most satisfactorymagnetic field.

Quantitative records-full of detail, quickly made,available for reference whenever needed-are pho-tography's contribution in a great many kinds ofscientific and engineering jobs. Kodak makes a largevariety of films and papers for them. Drop us a line,and we'll send you a complimentary copy of a newbooklet that helps you make the best selection amongthem. Eastman Kodak Company, Industrial Photo-graphic Division, Rochester 4, N. Y.

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QUANTUM THEORY OF MATTERBy JOHN C. SLATER, Massachusetts Institute of Technology. International Series in Pure and Ap-Plied Physics. 526 pages, $7.50

Treats quantum mechanics together with its applications to the structure of matter. First, the generalprinciples of quantum mechanics are introduced. Then the book proceeds to a discussion of the struc-ture of atoms, molecules, and solids, with attention to such properties as atomic spectra, intermolecularforces, "band theory" of solids, electrical conductivity, semiconductors, and dielectric and magneticeffects.

THIS FASCINATING ANIMAL WORLDBy ALAN DEVOE. 303 pages, $3.75

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SAMPLING INSPECTION BY VARIABLESBy ALBERT H. BOWKER and HENRY P. GOODE, Stanford Unixvcrsity. Ready in February

Presents a comprehensive set of sampling plans for use when the inspection of the item is by variablesand when the lot is to be evaluated in terms of its percentage defective. These plans can be used byindustrial and business concerns for acceptance sampling inspection of purchased goods, parts andraw materials; for sampling, inspection of goods within a concern; and for sampling inspection of out-going products.

TEXTBOOK OF WOOD TECHNOLOGY. Volume 2. The Physical, Mechanical and ChemicalProperties of the Commercial Woods of the United States

By H. P. BROWN, State University of New York; A. J. PANSHIN, Michigan State College; andC. C. FORSAITH. American Forestry Series. Ready in March

The companion volume to Structure, Identification, Defects, and Uses of the Commercial Woods ofthe United States, this text is divided into three parts which treat the physical, mechanical, and chem-ical properties of commercial woods. Derivations of almost all of the equations used in measuringthe physical and mechanical properties of wood are given. Recent advances are included.

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THEORETICAL PETROLOGY

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Dana'sSYSTEM OF MINERALOGY

Volume IIHalides, Nitrates, Borates, Carbonates,

Sulfates, Phosphates, Arsenates,Tungstates, Molybdates, etc.

By TOM. F. W. BARTH, Geological Museum at the Universityof Oslo. Conveniently divided into four sections-Physics andChemistry of the Earth, Formation of Sedimentary Rocks,Igneous Rocks, and Metamorphic Rocks-this book provides acomprehensive, scientific study of the rock-making processes,interpreting and synthesizing all existing data. January 1952.387 pages. $6.50.

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By ARTHUR W. SAMPSON, University of California. Empha-sizing the general principles of range management. Part I givesa comprehensive picture of the subject; Part II describes, illus-trates and discusses native forest plants; Part III shows how toimprove and manage stock and range; and Part IV providesmethods of protecting land resources and range livestock.January 1952. 570 pages. $7.S0.

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