BEATS are a wavy throbbing effect produced by the sounding together of certain notes, and most noticeable in unisons and consonances, when not perfectly tuned to one another.
To explain their origin reference must be made to elementary facts in the science of sound. Sound is conveyed to our ears by the waves into which the air, or other medium, is thrown by the vibration of what is called the sounding body. These waves are proportionally relative to the rapidity of...