John -- That's a Shireson resonator system in a Kay body. The Shireson Bros. were successful instrument builders in Los Angeles in the 1930s, but erred badly in using this cone/biscuit setup. National successfully sued them for patent infringement, and that was the end of the Shireson's business. (I've read that National was angry enough with Kay about their involvement that they gave future wood-body work to Harmony instead.)
I had a similar guitar -- with lightning-bolt shaped soundholes -- for a while. I'll post some pictures of that guitar -- and the cone/biscuit -- later today.
My Kay/Schireson, which I would describe as sounding like a cross between a biscuit and spider bridge:
The Schireson cone/biscuit/bridge; the Schiresons received a patent for this design in 1933, but somehow lost the suit to National in 1937:
By the way, the correct spelling is "Schireson." The Schireson Bros. -- Nathan and Jacob -- also built hollow-neck Hawaiian guitars under the names Mai Kai and Lyric, and may have built some Kona guitars along with Weissenborn.
Here's the patent for the Schireson cone/biscuit/bridge. As far as I can tell, it was granted, but National took them to court claiming it was an infringement on the single-cone patent that they got in 1931. (Note the "H" shaped soundholes -- "Hollywood" was one of the brands made by Schireson.)