The example which is perhaps most frequently cited as an illustration of the Doppler effect is the change of pitch of a locomotive bell or whistle or of a street-car gong in rapid motion, particularly as heard by a person on board a car passing rapidly in the opposite direction on a parallel track. To the use of this illustration Professor R. W. Wood objects on the ground that "scarcely one person in ten has any distinct recollection of having noticed the phenomena unless his attention has been directed to it".
Proceedings of the Iowa Academy of Science
©1906 Iowa Academy of Science, Inc.
Almy, Frank F.
"A Simple Demonstration of the Doppler Effect in Sound,"
Proceedings of the Iowa Academy of Science, 13(1), 229-229.
Available at: https://scholarworks.uni.edu/pias/vol13/iss1/33