from Maine Lingo: Boiled Owls, Billdads, & Wazzats by John Gould
GROANER: A foghorn with a prolonged moan and only one tone. A two-toned horn, listed on charts as a diaphone, is called a grunter.
GROANER: A foghorn with a prolonged moan and only one tone. A two-toned horn, listed on charts as a diaphone, is called a grunter.