Abstract: A grinding or polishing apparatus and method for grinding or polishing at least one workpiece, in particular having a ferromagnetic property, by way of barrel finishing, having at least one pot-like treatment container, mounted so as to be able to oscillate, for receiving one or more workpieces and grinding or polishing elements, also having at least one workpiece anchoring device for disposing one or more workpieces within the treatment container and for connecting the workpieces to the treatment container in a releasably secured manner, and also having at least one oscillation exciter, by means of which the treatment container can be oscillated, and in that the workpiece anchoring device comprises at least one switchable clamping plate, in particular at least one clamping plate having one or more permanent electromagnets, which is adapted such that a magnetic field emanating outwardly from a clamping surface of the clamping plate can be selectively activated or deactivated.

Abstract: A developing apparatus wherein a hollow drum-shaped conveyor has an internal partition with a set of tubular receptacles for exposed photosensitive material. The partition and one end wall of the conveyor define a chamber the lower portion of which contains a supply of liquid, and each receptacle has an open end in communication with the chamber. When the conveyor is set in rotary motion, the open ends of successive receptacles dip into the supply of liquid and scoop up some liquid which then flows out of the receptacles while they rise above and thereupon descend back toward the supply of liquid. Such liquid can be caused to indirectly exchange heat with water which is confined in a compartment at the other side of the partition and/or in a trough into which the lower portion of the rotating conveyor is immersed.