This small ad appeared a hundred years ago today, in the April 26, 1925, issue of the Washington Evening Star. It illustrated just how popular radio had become. Not only were radios being advertised in the newspaper, but for those who already owned a radio, there were advertisements for radio knobs.

The knobs in question were E-Z-Toon knobs from the E-Z-Toon Radio Company, 3234 W. Washington St., Indianapolis, Indiana.  As the name suggested, the knobs would make the radio easier to tune, especially in the problematic summer season, with a vernier drive.  If you’re looking for an example of an E-Z-Toon knob, you can find it at this e-bay listing.