Listed only by Maclean, who says: The name given by the Kimball Co. to a Diapason of relatively smooth, fluty tone. Some German builders have occasionally given the names Flötenprincipal and Principalflöte to a stop of this kind.

Muted Diapason 8'; Convention Center Ballroom, Atlantic City, New Jersey, USA; Kimball 1930. 10" pressure, 40 scale.