| Year | 1920 |
| Date | 20-May |
| Volume | 42 |
| Issue | 995 |
| Page | 476 |
| Category | General |
| Part | |
| Title | Pendulums: Some of their Applications |
| Author | V.E.Johnson |
| Notes | Experiment 12 the cycloidal pendulum, experiment 13 the mercurial pendulum, experiment 14 the conical pendulum - Watt's governor, Watt's governor, experiment15 weighing the earth, experiment 16 sand pendulum, experiment 17 (Blackburn's double pendulum), experiment 18 (Tisley's harmonograph, example of trace), experiment 19 - 20 some further applications - the ballistic pendulum - the metronome |