number of other configurations preferably each tip 118 is spaced apart from each adjacent tip an equal amount so as to minimize the effects produced on a given tip by adjacent tips other configurations are possible as well for distributing or positioning the tips over the surface of the nozzle including symmetrical and or asymmetrical the dimensions and configurations of the tips are preferably such as to minimize the restriction to flow of liquid to the tip minimize the size of the droplets ejected from the tips and to minimize the depositing of residue on the surface on the nozzle the tips can take any number of forms and may be substantially straight with a constant wall thickness or they may have a varying wall thickness but they preferably have a volcano shape fig4 or a converging tip end each tip preferably includes an outer surface 124 sloping inwardly toward a central axis 126 and outwardly away from the manifold 116 fig3 generally in the direction of the counter electrode the outer surface 124 converges to a substantially cylindrical wall 128 which is substantially circular in cross section the cylindrical wall 128 preferably terminates at a flat or squared off end face 130 and has a thickness u201c t u201d fig4 preferably as small as possible to minimize the surface area defined by the end face 130 and to minimize obstructions to uniform flow the interior wall of the tip 132.