| Year | 1939 |
| Date | 25-May |
| Volume | 80 |
| Issue | 1,985 |
| Page | 607 |
| Category | Electrical |
| Part | |
| Title | The Dynamo |
| Author | H.Chapman-Pincher |
| Notes | Generation of direct current. Simple magneto-magnetic machine, four-pole dynamo, two-pole dynamo, magnetic circuits, induction of poles in the armature |