| Year | 1942 |
| Date | 26-Nov |
| Volume | 87 |
| Issue | 2,168 |
| Page | 523 |
| Category | Electrical |
| Part | |
| Title | A Self-Generating Electric Torch |
| Author | "Artificer" |
| Notes | Gear cutting, pitching the gears, pivot bushes, gear shafts, rotor shaft and pinion, commercially-produced self-generating torches |