Previous ImageNext Image Helmholtz’s apparatus for the synthesis of sound, made by Rudolph Koenig. Image © Thomas B. Greenslade Jr. Individual Electromagnetic resonators with a keyboard Like this:Like Loading... Share this: Share on Facebook (Opens in new window) Facebook Share on Tumblr (Opens in new window) Tumblr Share on Pinterest (Opens in new window) Pinterest Share on X (Opens in new window) X Like this:Like Loading...