1. IN A FLUID AMPLIFIER HAVING A POWER STREAM INPUT DUCT FOR RECEIVING FLUID UNDER PRESSURE THEREIN, A PLURALITY OF OUTPUT DUCTS, A RECEIVER SECTION DISPOSED IN COMMUNICATION WITH SAID INPUT AND OUTPUT DUCTS FOR PASSAGE OF SAID FLUID FLOW FROM SAID INPUT TO SAID OUTPUT DUCTS, AND A PAIR OF CONTROL PORTS DISPOSED IN COMMUNICATION WITH THE ATMOSPHERE AND SAID RECEIVER SECTION, THE IMPROVEMENT RESIDING IN AN ACTUATOR CARRIED BY SAID FLUID AMPLIFIER FOR SELECTIVELY CLOSING OFF ONE OF SAID PAIR OF CONTROL PORTS WHILE MAINTAINING THE OTHER SAID CONTROL PORT OPEN TO THE ATMOSPHERE TO PROVIDE A PRESSURE DIFFERENTIAL ACROSS SAID FLUID IN SAID RECEIVER SECTION TO CONTROL FLOW OF SAID FLUID THROUGH A PRESELECTED ONE OF SAID OUTPUT DUCTS, SAID ACTUATOR INCLUDING AN ARM SECURED ON SAID OUTPUT DUCTS, SAID ARM HAVING THE DISTAL ENDS THEREOF CARRIED ADJACENT SAID CONTROL PORTS, ENERGIZING MEANS FOR PIVOTAL MOVEMENT OF SAID ARM, MOVABLE MEANS CARRIED IN EACH SAID CONTROL PORT, SAID MOVABLE MEANS BEING SECURED TO SAID ENDS OF SAID ARM FOR MOVEMENT THEREBY FOR SELECTIVELY OPENING OPPOSITE SIDES OF SAID RECEIVER SECTION TO THE ATMOSPHERE, WHEREBY RESPONSIVE TO THE OPENING OF ONE OF SAID CONTROL PORT AND THE CLOSING OF THE OTHER SAID CONTROL PORT A VACUUM IS CREATED IN SAID CLOSED CONTROL PORT AND A PRESSURE DIFFERENTIAL IS CREATED ACROSS SAID MOVABLE MEANS AND SAID ARM TO ASSIST SAID ENERGIZING MEANS IN THE PIVOTAL MOVEMENT OF SAID ARM.