Mixed device for generating longitudinal or shear waves

摘要: A mixed device for successively generating in the earth, at same location, longitudinal and shear waves is disclosed. The comprises association a target coupled to earth surface having first striking face substantially parallel thereto least one second perpendicular said face. guide tube adapted be positioned above perpendicularly thereto, movable weight slidable strike At hammer articulated support rigidly secured of target. Directional coupling means connect such manner that sliding directly impinges face, but released from effect impact on