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.