Behold the Trommelwähler!
by Cory Doctorow from on (#2GEGE)
https://www.youtube.com/watch?v=np5tJXFKhyU
From the Herbert H. Warrick, Jr. Museum of Communications, who note: "I've seen this style of dial illustrated in early human-factors study reports. I didn't know they actually made them! (more")