Elastic wave generator

Claim 1

APPARATUS FOR GENERATING HIGH INTENSITY ELASTIC WAVES IN A GASEOUS MEDIUM COMPRISING, A FIRST BODY HAVING AS CAVITY WITH A SINGLE OPENING THEREINTO, A PIN HAVING A POINTED END, SAID PIN BEING LOCATED AT LEAST IN PART IN SAID CAVITY AND EXTENDING IN THE DIRECTION OF A LINE WHICH EXTENDS FROM A WALL OF SAID CAVITY THROUGH SAID OPENING, SAID POINTED END BEING LOCATED OUTSIDE SAID CAVITY AND DIRECTED AWAY FROM SAID WALL, AND A SECOND BODY HAVING A GAS NOZZLE CONFRONTING SAID OPENING A ND SAID POINTED END FOR PROPELLING A STREAM OF GAS AT SAID POINTED END SUBSTANTIALLY IN SAID DIRECTION TOWARD THE INTERIOR OF SAID CAVITY, SAID SECOND BODY HAVING A SUBSTANTIALLY FLAT WAVE REFLECTING SURFACE SURROUNDING SAID NOZZLE, SAID NOZZLE EXTENDING ABOVE SAID SURFACE TOWARD SAID OPENING, THERE BEING A SUBSTANTIALLY FREE EXHAUST PATH FOR GAS PASSAGE IN DIRECTIONS NORMAL TO SAID FIRST-NAMED DIRECTION AND TANGENT TO SAID SURFACE FROM THE VICINITY OF SAID POINTED END ALONG SAID SURFACE, SAID PATH SUBSTANTIALLY INCLUDING SAID POINTED END.