A mount for optical elements includes a frame and a holder for holding optical elements such as lenses andor an image detecting element such as a CCD. The portable chafing stand system includes a pair of end members and a pair of side members attachable to one another. Each expandable compartment holds the mail for a single delivery point. The second development difference of potential is greater than the first development difference of potential so that second toner that is different from the first toner, is developed onto the first toner using the second net development difference of potential. The medium further receives results of the calculation of the transform of the matrix by the nodes.