XVII. The Resistivity of Hardened Cast Iron as a Measure of its Temper and of its Fitness for Use in Permanent Magnets

Chapters in this book

1. Frontmatter i
2. PREFACE vii
3. CONTENTS ix
4. I On the Temperature Coefficients of Magnets made of Chilled Cast Iron 1
5. II. On Families of Curves which are the Lines of Certain Plane Vectors either Solenoidal or Lamellar 9
6. III. On Generalized Space Differentiation of the Second Order 24
7. IV. On the Properties of Magnets made of Hardened Cast Iron 34
8. V. On the Manner of Growth of a Current in the Coil of a nearly- Closed Electromagnet as influenced by the Width of the Air Gap 50
9. VI. On the Permeability and the Retentiveness of a Mass of Fine Iron Particles 87
10. VII. On the Conditions to be Satisfied if the Sums of the Corresponding Members of Two Pairs of Orthogonal Functions of Two Variables are to be themselves Orthogonal 92
11. VIII. On the Determination of the Magnetic Behavior of the Finely Divided Core of an Electromagnet while a Steady Current is being established in the Exciting Coil 100
12. IX. The Damping of the Oscillations of Swinging Bodies by the Resistance of the Air 183
13. X. On the Magnetic Behavior of Hardened Cast Iron and of certain Tool Steels at High Excitations 210
14. XI. The Theory of Ballistic Galvanometers of Long Period 220
15. XII. On the Permeabilities and the Reluctivities, for very Wide Ranges of Excitation, of Normal Specimens of Compressed Steel, Bessemer Steel and Norway Iron Rods 248
16. XIII. On the Magnetic Properties at High Excitations of a remarkably Pure Specimen of Soft Norway Iron 264
17. XIV. The Conception of the Derivative of a Scalar Point Function with respect to another Similar Function 271
18. XV. The Effect of Leakage at the Edges upon the Temperatures within a Homogeneous Lamina through which Heat is being Conducted 285
19. XVI. The Magnitude of an Error which sometimes affects the Results of Magnetic Tests upon Iron and Steel Rings 290
20. XVII. The Resistivity of Hardened Cast Iron as a Measure of its Temper and of its Fitness for Use in Permanent Magnets 299
21. XVIII. The Magnetic Permeabilities at Low Excitations of Two Kinds of very Pure Soft Iron 318
22. XIX. The Effects of Sudden Changes in the Inductances of Electric Circuits as illustrative of the Absence of Magnetic Lag and of the Von Waltenhofen Phenomenon in Finely Divided Cores. Certain Mechanical Analogies of the Electrical Problems 323
23. XX. The Anomalous Magnetization of Iron and Steel 368
24. XXI. The Maximum Value of the Magnetization in Iron 408
25. Bibliography 439