1Posted on 09/22/2016 at 14:19:28[Getting started] Plasma Loudspeakers
In this chapter we'll discuss a not-so-widely spread category of transducers based on very amazing principles. They can make some people dream because they are freed from the mechanical stages of transduction – although it comes at a cost.
The 1900s engineer was Duddell (not Durdell, a typo I think), otherwise a goos short history. There's a whole lot more info over here https://massless.info/How-old.html , with some details about other models as well.