Seismograph Service Corp.

William E Lerwill

Antoni M Ziolkowski

A seismic method and apparatus utilizes two point sound sources located at the same location on the earth to produce sound waves at different amplitudes and times. The reflections of the sound waves are analyzed to determine the acoustic properties and rock boundaries within the earth.

Seismographic method and apparatus using scaled sound sources

Apparatus for generating vibrations in a medium, such as the ground, comprises a first member which contacts the medium, means, preferably electromagnetic, which includes two relatively movable members for generating vibrations in the apparatus and means operatively connecting the said two members to said first member such that the relatively amplitudes of the movements of said three members can be adjusted to match the impedances of the apparatus and the medium.

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Keston, United Kingdom

William E Lerwill