In a processing device the wire-ends are fed circularly to the peripherally arranged processing units. The gas supply device supplies a scavenging gas to the fuel cell. The method then computates a net force exerted on each image by every other image, wherein the net force acting on any one image is a function of the field acting on the said any one image and a characteristic of the said any one image. For example, the constraint mechanism may include a center wall to prevent yawing, and rear tabs to prevent pitching. The second flange is substantially parallel to the first flange. The ambient operating temperature of the confined enclosure is minimized by a combination of component locations, sizing and a thermal siphoning exhaust enclosure.