  We study the acoustical intensity field radiated by a thin cylindrical rod
vibrating in its lowest compressional mode. Due to the cylindrical symmetry,
the emitted field is measured in a radial plane of the rod which is sufficient
to reconstruct the full three-dimensional field. Starting from the
one-dimensional approximation of the excited compressional mode, we develop a
simplified theoretical wave equation which allows for a semi-analytical
solution for the emitted wave field. The agreement between the experimental
results and the semi-analytical solution is eloquent.
