Abstract: An agitator for use in developing photographic film has an upright oscillatable shaft with a platform at its upper end for supporting a developing tank, spring means urging the upright shaft to a neutral position, a motor-driven shaft normal to the upright shaft, a pair of radial arms carried by the motor-driven shaft, and a pair of vertically spaced arms carried by the upright shaft and extending across the path of movement of the radial arms. Upon rotation of the motor-driven shaft a first radial arm contacts a first spaced arm and rotates the upright shaft from its neutral position. When the first radial arm passes by the first spaced arm the spring means returns the upright shaft toward its neutral position until the first spaced arm strikes the second radial arm. The second radial arm then acts on the first spaced arm to rotate the upright shaft away from the neutral position.

Abstract: A rotary drum filter arrangement in which an endless flexible filter belt is trained around at least 270.degree. of the vacuum drum and leaves the vacuum drum for application of a slurry and formation of a cake remote from the drum. In one form of the invention the slurry is applied to a substantially horizontal portion of the belt prior to entry onto the vacuum drum so gravity aids in initial dewatering. In another form of the invention the cake is formed by an auxiliary vacuum drum prior to entry onto the main vacuum drum. By utilizing at least 270.degree. of the vacuum drum after formation of the cake, the invention provides a drier cake, easier adaptation of auxiliary washing and drying equipment and/or permits the use of a smaller vacuum drum.

Abstract: A band saw drive arrangement including relatively large driven and idler pulleys and a relatively small drive pulley. The pulleys are all V-grooved pulleys and are mounted in coplanar relationship for rotation about spaced, parallel axes, with the drive pulley positioned between the driven and idler pulleys. The drive pulley is motor driven and an endless flexible V-belt is trained about the drive and driven pulleys. A V-belt is also secured in the groove of the idler pulley. An endless flexible saw band is trained about the driven and idler pulleys with its inner surface in frictional driving engagement with the outer surfaces of the V-belts.