Original Selmer ToneX Resonator Sizes

You know how when you write the same word over and over it can begin to look wrong? Researching this article felt like that, because there are very few primary sources calling these resonators "ToneX". ToneX was a pad, ToneX was even a trumpet mouthpiece, but in their ad copy advertising Selmer saxophones , Selmer simply called them tone boosters. More on that below the measurements. Anyhow, what…