LIST OF ILLUSTRATIONS 



no. 



1. Graph of Alternating Current """{ 



2. Sine Wave .4 



8. Vector, or Clock-face Diagram 4 



4. Graphs of Two Sine Waves, with a Phase Difference 6 .... 5 



5. Vector Diagram for Pure Resistance 10 



6. Vector Diagram for Pure Inductance 10 



7. Vector Diagram for Pure Capacity 11 



8. Vector Diagram for Inductive Resistance 12 



9. Arrangement of Resistance, Inductance, and Capacity in Series ... 12 



10. Vector Diagram for Inductive Resistance in Series with Capacity . . 14 



11. Decomposition of Current into Power and Wattless Components . . 16 



12. Two Impedances in Series 17 



13. Series Arrangement of Impedances 19 



14. Vector Diagram of Currents in Branched Circuit 20 



15. Vectorial Addition of Admittances 21 



16. Circuit containing Resistances, Inductances, and Capacities . . .22 



17. To illustrate Principle of Shaded-pole Motor 26 



18. Shaded-pole Motor 27 



19. Graphs of Two-phase Currents 29 



20. Graphs of Three-phase Currents 80 



21. Vector Diagrams of Two- and Three-phase Systems 30 



22. Production of Rotating Field by Two -phase Currents .... 82 



23. Rotating Field produced by Three-phase Currents 32 



24. Interconnected Two-phase System 34 



25. Star-connected Three-phase System 34 



26. Delta-connected Three-phase System 85 



27. Type of Alternating- current Machine . . .... 87 



28. Simple Sine Wave of Flux 87 



29. Oscillations of Simple Alternating Wave 38 



30. Rotating Waves of Flux 40 



31. Connections of Wattmeter 45 



82. Effect of Reactance in Shunt Circuit of Wattmeter 47 



33. To illustrate Capacity Effect in Wattmeter 47 



34. To illustrate Effect of Mutual Inductance 50 



35. Power Measurement in Two-phase Circuit 51 



36. Power Measurement in Three-phase Circuit 52 



37. Vector Diagram of Three-phase Circuit 53 



38. Vector Diagram of Three-phase Circuit . . .... 54 



89. Vector Diagram of Balanced Throe-phase Circuit 



40. Vector Diagram of Unbalanced Non-inductive Three-phase Load . . 58 



