i always feela bit filthy after using the trademark horizonline in bryce hehe

Doppler Effect – History..( if interested )

During Doppler’s lifetime, it was well known that the pitch of a sound would vary if the object was moving relative to a listener. Mainly, this was noticed with train whistles when they would increase in pitch when they got closer, and decrease as the train went away. In order to measure this effect, Doppler created a strange experiment. He hired a group of trumpeters to play from a moving train car. He then had musicians with nearly perfect pitch recognition listen to the trumpets as the train traveled towards and away from them.

....eeeeeeeeeEEWWWWHHHEEEeeeeee........