profile i e a gas plume 116a can be changed fig4 and 5 show a sectionalized elongated nozzle 110a in which gas pressure and velocity can be selectively changed and controlled according to the invention the lines midway through these depicted nozzles are meant to show that the invention may contain many more chambers than are actually depicted in the accompanying figures with respect to the fractionalized nozzle so depicted gas is supplied thereto by a plurality of conduits 120 connected to a housing structure 122 the housing structure has an interior 124 that provides an elongated plenum for receiving gas flows from the ends of the conduits connected to the housing the gases are directed to the conduits from a supply thereof not shown under varying pressures to effect the plume 116a shown in fig3 of the drawings in the preferred embodiment shown in fig4 numerals p 1 to p 5 are used to designate five pressures of the gas flow through the five conduits 120 depicted the gas pressure combination necessary to effect the uniform mass flow of fluid material 112a on a planar substrate would have essentially equal pressures near the opposed ends p 1 and p 5 of.