Text
Armstrong Cork,. 1932. “Armstrong's Acoustical Products”. Corkoustic, Ceramacoustic For Acoustical Correction Of Churches, Auditoriums, And Theatres, And Noise-Quieting Of Banks, Schools, Hospitals, Offices, Sunday School Rooms, Factories, And Other Public Buildings. Lancaster, PA.
Text
Celotex Company of Great Britain,,. 1929. “Colorful Decoration With Good Acoustics”.
Object, Instrument, Technology

Seventeenth-century Daniel Herz Organ at Frauenkirche in Bressanone / Brixen. The upper keyboard contains 17 notes per octave (except for the lowest octave, which contains 10 notes). The lower keyboard is a modern addition.

 

Picture: © Leon Chisholm

Object, Instrument, Technology

Date: 1962

Image
“Mit Choral Society Concert Poster, Freie Universität Berlin, 1962 (1)”. n.d.
Image
1936. Berlin.
Text
Smith, Hermann. 1874. “On The Process Of Tone-Making In Organ-Pipes”. Nature 10 (259): 481-482.