25
13. Magnetized field 26
14. Magnetized bar 26
15. Direction of current 27
16. Direction of induction current 28
17. Frictional-electricity machine 30
18. Leyden jar 32
19. Galvanic electricity. Crown of cups 33
20. Voltaic electricity 34
21. Primary battery 36
22. Dynamo field and pole piece 39
23. Base and fields assembled 41
24. Details of the armature, core 42
25. Details of the armature, body 42
26. Armature Journals 43
27. Commutator 43
28. End view of armature, mounted 44
29. Top view of armature on base 45
30. Field winding 47
31. Series-wound 47
32. Shunt-wound 48
33. Compound-wound 48
34. Compass magnet, swing to the right 50
35. Magnetic compass 50
36. Magnet, swing to the left 50
37. Indicating direction of current 51
38. The bridge of the detector 52
39. Details of detector 53
40. Cross-section of detector 54
41. Acid voltameter 56
42. Copper voltameter 56
43. Two-pole switch 66
44. Double-pole switch 66
45. Sliding switch 67
46. Rheostat form of switch 68
47. Reversing switch