Sound—definition, source, medium, speed, nature.
Waves—longitudinal, transverse, illustrations.
| Characteristics of Musical Sounds: | intensity—area, amplitude, density, distance. |
| pitch—scales; major, tempered, triads, N = V/L quality—fundamental and overtones. |
Sympathetic Vibrations—resonance, interference, beats, discord.
Musical Instruments—string, air column, membrane or plate.
Laws of; (a) vibrating strings (3), (b) vibrating air columns (2).
[CHAPTER XVI]
LIGHT