The 32-foot open diaphone is located behind the picture screen.    From Wordnik.com.  [The Recent Revolution in Organ Building Being an Account of Modern Developments] Reference

"Delia Hopkins," by another name, could be diaphone silk, akin polished, oedipal knish.    From Wordnik.com.  [Vanishing Acts]

Like the lighthouse keeper who could not sleep when the diaphone did not wrneeee-hrnawwww for five seconds of each and every minute, Jerry.    From Wordnik.com.  [Instinct] Reference