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136 SLENDER STRUCTURES AND AXIAL FLOW
Figure 3.45 (continued).
the pipe referred to above. The data points within each set for the same value of /3 represent
experiments with different lengths of the same pipe; experiments were conducted with a
given initial length, subsequently shortened in steps by cutting off pieces of the pipe. The
internal (material) damping used in the theory is an average for all the experiments, but
nevertheless taking it into account improves agreement between theory and experiment,
