Abstract: An apparatus for breaking or crushing one or more objects into a plurality of smaller objects. The apparatus comprises a canister, an impeller disposed within the canister, and a means for rotating the impeller. The objects to be crushed are fed into the canister through an inlet port formed in a first side plate of the canister. The crushed objects are discharged from the canister through an outlet port formed in a second side plate of the canister. In one embodiment, the canister is formed such that the cross-sectional shape of the canister parallel to the first side plate is asymmetric with respect to the axis of rotation of the impeller. In another embodiment, the impeller comprises a plurality of blades formed with a paddle curved such that the concave end of the paddle faces into the airflow as the impeller is rotated. In yet another embodiment, the first side plate is formed opposite the second side plate so that the outlet port is on an opposite side of the canister from the inlet port.

Abstract: Apparatus for utilization in driving a raster-type display, such as is used in the familiar television system for producing a selectable (according to a predetermined group) of raster formats of different raster interlace rates.

Abstract: Apparatus for stabilizing the range of black to white level in a signal to a cathode ray tube, especially a signal produced by a detector in a charged particle microscope system. The stabilizing apparatus includes electronic circuitry for remembering the most negative (blackest) excursion of the signal for a predetermined time period, means for stabilizing all video input to that level and means for controlling the range of the signal (black to white) to remain within predetermined limits.