| Description | English: Warren G. Harding speaks through a Magnavox loudspeaker |
| Date | 1921 |
| Source | Magnavox advertisement in Talking Machine World (https://archive.org/details/talkingmachinewo17bill/page/n233/mode/2up) |
| Author | Anonymous |
From an advertisement for Magnavox, the newfangled electrical amplification system.