Sonic pressure wave generator

Claim 1

A GAS-OPERATED PRESSURE WAVE GENERATOR, SAID GENERATOR COMPRISING, IN COMBINATION, A GAS-ACCELERATING NOZZLE COMPRISING A BODY MEMBER FORMING A GAS FLOW PASSAGEWAY, FIRST, SECOND AND THIRD LONGITUDINAL POSITIONS, IN SAID BODY MEMBER, SAID SECOND POSITION BEING SPACED FROM SAID FIRST POSITION IN THE DIRECTION OF FLOW OF GAS THROUGH SAID NOZZLE AND SAID THIRD POSITION BEING SPACED FROM SAID SECOND POSITION IN THE DIRECTION OF FLOW OF GAS THROUGH SAID NOZZLE, RESTRICTOR MEANS REDUCING THE CROSSSECTIONAL AREA OF SAID GAS FLOW PASSAGEWAY AND FORMING A REDUCED ORIFICE AT SAID FIRST LONGITUDINAL POSITION, STABILIZING MEANS IN SAID GAS FLOW PASSAGEWAY BETWEEN SAID REDUCED ORIFICE AND SAID SECOND LONGITUDINAL POSITION, SAID STABILIZING MEANS PROVIDING A SUBSTANTIALLY CONSTANT CROSS-SECTIONAL AREA FOR SAID PASSAGEWAY BETWEEN SAID REDUCED ORIFICE AND SAID SECOND LONGITUDINAL POSITION, AND STABILIZING MEANS ALSO PROVIDING ANOTHER ORIFICE AT SAID SECOND LONGITUDINAL POSITION, SAID OTHER ORIFICE HAVING A CROSS-SECTIONAL AREA SUBSTANTIALLY EQUAL TO THAT OF SAID REDUCED ORIFICE, EXPANSION MEANS IN SAID GAS FLOW PASSAGEWAY BETWEEN SAID OTHER ORIFICE AND SAID THIRD LONGITUDINAL POSITION, SAID EXPANSION MEANS PROVIDING AN INCREASING CROSS-SECTIONAL AREA FOR SAID PASSAGEWAY BETWEEN SAID OTHER ORIFICE AND SAID THIRD LONGITUDINAL POSITION IN THE DIRECTION OF FLOW OF GAS THROUGH SAID NOZZLE, RESONATOR MEANS, AND MEANS FOR POSITIONING SAID RESONATOR MEANS ADJACENT THE EXIT OPENING OF SAID GAS FLOW PASSAGEWAY.