The Timbre of Orchestral Instruments
Carl Emil Seashore, Donald R. Rothschild · The Journal of the Acoustical Society of America · 1934
Harmonic analysis has been made of ten representative instruments with two variables: (1): a sampling of pitch throughout the normal register of the instrument, and (2), for each tone, a loud and a soft rendition. The results give a graphic picture of the characteristics of each instrument and its range of variability dependent on pitch and intensity.