a great distance the ultrasonic oscillations do not break up or nebulize the fluid 42 at the surface 37 such fluid remaining dynamically at rest during the ejection of fluid 42 within the aperture 40 ejection continues until all the fluid 42 is drawn from the surface 37 and ejected forwardly as droplets 44 in this preferred embodiment the diameter of the large opening 46 of the aperture 40 is 0 006 u2033 and the diameter of the small opening 47 is 0 0025 u2033 the thickness of the planar surface 37 is 0 003 u2033 and the oscillation frequency is 50 khz which is the third natural frequency of the beam 32 referring now to fig1 the ejector 30 described in the specification with respect to fig9 and 11 is now provided with a fluid supply system 50 that continuously transports fluid 51 to wet the oscillating surface 37 via a supply tube 53 ending at a supply nozzle 54 the fluid 51 is transported to the surface 37 at a rate which is lower than the maximum ejection rate of the apertures 40 to prevent overflow of fluid 42 from the supply side of the oscillating surface 37 a pinch valve 56 controls delivery of the fluid 51 to the oscillating surface 37 the fluid supply system 50 is connected to an electronic flow control valve 52 which in the preferred embodiment is made by ics sensors the valve 52 is connected to an electronic circuit that detects the.