Text
Wood Conversion,,. 1939. “Nu Wood ..”. Decorative, Acoustical, Structural Insulation.
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
Armstrong Cork,. n.d. “Reducing Vibration And Noise”. Nonpareil Cork Machinery Isolation For Reducing The Noise And Vibration Of Fans, Motors, Printing Presses And Machinery Generally. Pittsburgh, PA.
Text
Armstrong Cork,. n.d. “Armstrong's Vibracork For Lessening Transmission Of Vibration”.
Video
Braguinski, Nikita. 2018. Brüel & Kjær 2304 Level Recorder (Video).
Object, Instrument, Technology

Date of production: 1950s

Image
“Brüel & Kjær 2304 Level Recorder (1)”. n.d.
Image
“Brüel & Kjær 2304 Level Recorder (2)”. n.d.
Object, Instrument, Technology

This photograph shows a three-dimensional representation of sound using paper. The spectrum (frequencies from low to high) is represented by an arrangement of single strips of paper, with lower frequencies in the foreground. The changes in the spectrum over time are visible as variations in the profile of the paper strips, if read from left to right. Such paper models were used at the Technische Universität Berlin in the 1960s to represent the sounds of speech (phonetics) and music (acoustics).

Image
“Handmade Paper Waterfall Plot: Mississippi (1)”. n.d.