This stop, whose name is derived from Greek words êdonê (�pleasure�) and fônê (�voice�), is listed only by Wedgwood, who says: A stop invented by Mr. Hope-Jones, and consisting of metallic plates set into vibration by an alternating current of air. The tone resembled that of gongs. No example exists, but a specimen was exhibited at a lecture delivered by Mr. Hope-Jones at Birkenhead. Bibliography Wedgwood[1]: Hedeiaphone. FOOTER Original site compiled by Edward L. Stauff. For educational use only. Hedeiaphone.html - Last updated 18 March 2000. Home Full Index