field of between 10 3 and 10 4 volts per centimeter application_number US 43797089 A description referring now to fig1 the present invention has a 34 u 34 shaped supporting insulator frame 10 having a vertical section 12 an upper horizontal support member 14 integrally connected to the vertical section 12 having a centrally disposed rod hole 16 therein and a lower horizontal support member 18 integrally connected to the vertical section 12 having a centrally disposed rod hole 20 therein which is in axially alignment with rod hole 16 the insulator frame may be made of material such as polystyrene the vertical section 12 has a notched cut out coil support section 22 and 22 39 therein for holding series wound electrical heater coil wires 24 24 39 on frame coil support legs 26 26 39 respectively a fixed stainless steel disc shaped electrode member 28 is horizontally supported on a stainless steel rod 30 which is fixedly held in the lower horizontal support member rod hole 20 a high voltage connecting wire 32 is electrically connected to rod 30 a second adjustable stainless steel rod 34 is slidable positioned in the upper horizontal support member hole 22 and has a second stainless steel disc electrode 36 supported on one end thereof so that it is parallel to electrode disc 28 and axially aligned therewith a high voltage connecting wire 38 is electrically connected to the.