| Year | 1920 |
| Date | 13-May |
| Volume | 42 |
| Issue | 994 |
| Page | 453 |
| Category | General |
| Part | |
| Title | Pendulums: Some of their Applications. Introductory |
| Author | V.E.Johnson |
| Notes | The simple pendulum, experiment 1, experiment 2 (Foucault), experiment 3 (Galileo), experiment 4, experiment 5 (Newton), experiment 6, experiment 7 (the swing), experiment 8, experiment 9 & 10 (sympathetic pendulums), experiment 11 - gyroscopic pendulum |