Mentioned only by Irwin, who says: “The Viola Diapason is less bright than [the Violin Diapason], and has about the same aount of fundamental in its tone.” We can only assume it to be a cross between a Viola and a Diapason.

Examples

Viola Diapason 8', Swell; First Baptist Church, Hallowell, Maine, USA; Hamill 1880.

Viola Diapason 8', Swell; First Church of Christ, Scientist, San Francisco, California, USA; Kimball 1924.

Viola Diapason 8', String Organ II; Convention Hall, Atlantic City, New Jersey, USA; Midmer-Losh 1929-32.

Viola Diapason 16', Pedal; Convention Hall Ballroom, Atlantic City, New Jersey, USA; Kimball 1930.

Bibliography