File:Carbon microphone, c. 1920s, Ellis Electrical Laboratories - Museum of Science and Industry (Chicago) - DSC06626.JPG - Wikimedia Commons
![The Carbon Microphone · Steele Vintage Broadcast Microphone Collection · UGA Special Collections Library Online Exhibitions The Carbon Microphone · Steele Vintage Broadcast Microphone Collection · UGA Special Collections Library Online Exhibitions](https://digilab.libs.uga.edu/scl/files/thumbnails/22955a974d3fe3693f513c864f9c1695.jpg)
The Carbon Microphone · Steele Vintage Broadcast Microphone Collection · UGA Special Collections Library Online Exhibitions
![Marconi-Reisz Carbon Microphone (circa 1930) Just the job for a Kings Speech or two! Also very popular with other personalities of 1930's European showbiz! | Martin Mitchell's Microphones Marconi-Reisz Carbon Microphone (circa 1930) Just the job for a Kings Speech or two! Also very popular with other personalities of 1930's European showbiz! | Martin Mitchell's Microphones](https://martinmitchellsmicrophones.files.wordpress.com/2012/04/carbon-mic-preamp-for-blog.png)