Abstract: A pressure developing apparatus is described for use in developing images in the image area of a photosensitive imaging sheet containing microcapsules, wherein the apparatus comprises:an arm which oscillates in arcuate paths across the surface of the imaging sheet;means for oscillating the arm across the surface of the imaging sheet;means for establishing longitudinal movement between the arm and the imaging sheet; anda developer head positioned along the shaft of the arm, the developer head further containing at least one point contact element which is resiliently biased into contact with a surface of the imaging sheet such that the point contact element traverses the surface of the imaging sheet in sequential increments to provide a plurality of paths and applies uniform pressure sufficient to rupture the microcapsules in substantially the entire image area.