| Year | 1923 |
| Date | 07-Jun |
| Volume | 48 |
| Issue | 1,154 |
| Page | 607 |
| Category | Radio Engineering |
| Part | |
| Title | Wireless Telephony and the Crystal |
| Author | A.V.Ballhatchet |
| Notes | Pendulum analogy to explain damped and undamped waves, wave diagram, formation of "beats", rectifying action of a crystal on modulated undamped waves |