Indianapolis World Instruments Series of a Bull Roarer, an ancient ritual musical instrument and means of communicating over extended distances. The bullroarer is sometimes used as a means of demonstrating the Doppler effect, by using sound. As the instrument travels round, its sound goes up or down according to its speed, and distance from the hearer. Painted style. 6 lines print. Logo - Musical Theme - Guitars Drums Logos etc Pattern. This pin was sold through retail and/or online. Base Material is Gold Appearance
