The autoharp is usually dismissed as a quaint campfire instrument, but this episode digs into the surprisingly complex machine underneath. We break down how a 36-string box zither with felt-padded chord bars works like a reverse fretboard, muting everything you do not want so a strum produces a perfect chord, and why the standard tuning skips notes like G-sharp 3 to keep tension and size manageable.

From there the story turns to a fierce 1880s patent fight between Charles F. Zimmerman, who coined the name and won a first-degree merit certificate at the 1884 World Cotton Centennial, and the German inventors Gutter and Lindemann, whose suspiciously timed British filing ended up identical to Zimmerman's design. We follow the trademark battle that made the word generic, the rise of diatonic harps built for loud folk jams, Cecil Null and Kilby S ...