| Year | 1930 |
| Date | 01-May |
| Volume | 62 |
| Issue | 1,512 |
| Page | 415 |
| Category | Electronic |
| Part | |
| Title | Everyday Wireless Hints |
| Author | "Radiophile" |
| Notes | What sound is, what audio-frequency means, vibration corresponding to the vowel "e", complicated vibration corresponding to human speech, other methods of sound transmission, transmitting sound by telephony, wireless waves, transmitting sound by radio |