Abstract
In this paper the author has shown the correct method of vibration analysis of solid elastic structure, taking an example in the problem of transversal vibration (in vertical plane) of continuous truss-bridge on many piers. He has also applied in this paper his long-cherished opinion as to the phase velocity of longitudinal progressing-wave in solid elastic bar, which was already reported in his previous paper, ' Phase Velocity of Longitudinal Impact Wave in Solid Elastic Bar ' in the Trans. of JSCE, No. 260, April, 1977.
