ORGAN PIPES -
PITCH AND BEATS
EQUIPMENT
Organ Pipes
Plexiglas
Organ Pipe Box
NARRATIVE
Several
adjustable organ pipes are available. The pitch may be varied by sliding the plunger
through the tube. The progression from low pitch to high pitch as the plunger is inserted
is not uniform. At a certain point, the second harmonic dominates, doubling the pitch. The
other two pipes are inserted in a box which is connected to compressed air. The variable
length pipe may be adjusted to demonstrate beats due to the different frequencies of the
two pipes.