| Year | 1920 |
| Date | 24-Jun |
| Volume | 42 |
| Issue | 1,000 |
| Page | 578 |
| Category | Electronic |
| Part | 5 |
| Title | The Action of the Wireless Telephone |
| Author | R.A.Mallet |
| Notes | 1. - Microphones, a variable resistance, 2. - Telephones, 3. - Leads and wiring of sets, the tinfoil condenser, 4. - Batteries, 5. - Other Parts of the Apparatus, sketch of the Lieben-Reisz valve, 6. - Valves |