Preface; 1. Historical introduction; 2. Generalities concerning electromagnets and electromagnetism. Typical forms of electromagnets. Materials of construction; 3. Properties of iron; 4. Principle of the magnetic circuit. The law of traction; Design of electromagnets for maximum traction; 5. Extension of the law of the magnetic circuit to cases of attraction of an armature at a distance. Calculation of magnetic leakage; 6. Rules for winding copper wire coils; 7. Special designs. Rapid-acting electromagnets. Relays and chronographs; 8. Coil-and-plunger; 9. Electromagnetic mechanism; 10. Electromagnetic vibrators and pendulums; 11. Alternate-current electromagnets; 12. Electromagnetic motors; 13. Electromagnet machine tools; 14. Modes of preventing sparking; 15. The electromagnet in surgery; 16. Permanent magnets; Appendix; Index.