"… the speaking incandescent electric lamp, the singing arc, and the talking flame — measures of desperation these were; yet each came in for its share of attention as the search continued"
Frederick Hunt, Electroacoustics, 1954
"... I tried talking arcs and thermophones, and also a corona discharge device - all of which avoid mechanical moving parts - but none of these appeared promising."
Edward Kellogg, 1955, on his study with Rice, 1925