1. Introductory. 2. Historical Notes. 3. Physical Theory of Dynamo-Electric Machines. 4. Magnetic Principles; and the Magnetic Properties of Iron. 5. Forms of Field-Magnets. 6. Magnetic Calculations as Applied to Dynamo Machines. 7. Copper Calculations; Coil Windings. 8. Insulating Materials and their Properties. 9. Actions and Reactions in the Armature. 10. Commutation; Conditions of Suppression of Sparking. 11. Elementary Theory of the Dynamo, Magneto and Separately Excited Machines, Self-exciting Machines. 12. Characteristic Curves. 13. The Theory of Armature Winding. 14. Armature Construction. 15. Mechanical Points in Design and Construction. 16. Commutators, Brushes and Brush-Holders. 17. Losses, Heating and Pressure-Drop. 18. The Design of Continuous Current Dynamos. 19. Analysis of Dynamo Design. 20. Examples of Modern Dynamos (Lighting and Traction). 21. Dynamos for Electro-Metallurgy and Electro-Plating. 22. Arc-Lighting Dynamos and Rectifiers. 23. Special Types of Dynamos; Extra High Voltage Machines, Steam-Turbine Machines, Extra Low Speed Machines, Exciters, Double-Current Machines, Three-Wire Machines, Homopolar (Unipolar) Machines, Disk Dynamos. 24. Motor-Generators and Boosters. 25. Continuous-Current Motors. 26. Regulators, Rheostats, Controllers and Starter. 27. Management and Testing of Dynamos. Appendix, Wire Gauge Tables. Index. 996 pages, 573 illustrations, 4 colored plates, 32 large folding plates. 8vo., cloth. $7.50.[++] * * * * * Alternating-Current Machinery BEING VOL. II OF Dynamo-Electric Machinery. BY SILVANUS P. THOMPSON, D.Sc., B.A., F.R.S. Owing to the enormous increase in the use of electrical machinery since the publication of the sixth edition of DYNAMO-ELECTRIC MACHINERY the author has deemed it advisable to divide the work. Vol. I. is devoted to DIRECT CURRENT MACHINERY and this the second part. Vol. II. ALTERNATING CURRENT MACHINERY. Amongst the many new features treated special mention must be made of the number of fine colored plates of windings and the many large folding scale drawings. These two volumes make the most comprehensive and authoritative work on dynamo machinery. The work has been so universally adopted that it has been found necessary to translate it into French and German. CONTENTS OF CHAPTERS.