Wedge scan for echo locating system

Claim 1

IN COMBINATION, A PULSE ECHO LOCATOR SYSTEM COMPRISING MEANS FOR TRANSMITTING PERIODIC IMPULSES TO REMOTE OBJECTS, RECEIVER MEANS FOR RECEIVING REFLECTIONS THEREFROM COMPRISING APPARATUS FOR PROVIDING AT LEAST ONE PAIR OF DIRECTIONAL OVERLAPPING ZONES OF RECEPTION DISPOSED IN OPPOSING ANGULAR RELATION ABOUT AN AXIS OF DIRECTIVITY, A CATHODE RAY TUBE INDICATOR MEANS COUPLED TO THE OUTPUT OF SAID RECEIVER MEANS TO INDICATE THE PHASE RELATIONSHIP OF THE SIGNAL ENERGY RECEIVED BY SAID OPPOSING ZONES OF RECEPTION COMPRISING A LOW FREQUENCY DEFLECTION CIRCUIT FOR DEFLECTING THE ELECTRON BEAM OF SAID CATHODE RAY TUBE IN A FIRST DIRECTION IN RESPONSE TO THE EMISSION OF SAID PERIODIC IMPULSES, AND MEANS INCLUDING A HIGH FREQUENCY DEFLECTION CIRCUIT FOR SIMULTANEOUSLY DEFLECTING SAID ELECTRON BEAM IN A SECOND DIRECTION SUBSTANTIALLY AT RIGHT ANGLES TO SAID FIRST DIRECTION, SAID LAST NAMED MEANS FURTHER INCLUDING A MODULATOR CIRCUIT CONNECTED TO SAID LOW FREQUENCY DEFLECTION CIRCUIT TO UNIFORMLY INCREASE THE AMPLITUDE OF ELECTRON BEAM DEFLECTION IN SAID SECOND DIRECTION SYNCHRONOUSLY WITH THE BEAM DEFLECTION IN SAID FIRST DIRECTION.