Abstract: A cell filter apparatus of the bag or stocking type having a housing is disclosed. A gas deflector and boundary wall between a raw gas duct and a dust chamber upstream from the filter cells form a tapering duct having an outlet passage for coarse dust particles at its narrow end. Either the deflector or the boundary wall is pivoted so that the size of the outlet passage can vary so as to remove coarse dust from the outlet passage. A gas blast for cleaning the filter cells in a direction to move the pivoted element so that the outlet passage is varied and cleaned.

Abstract: A device for randomizing the operation of an electrical switch such that it can be used to switch electrical devices at random time intervals. This device uses a mechanism which periodically disconnects a drive train from a motor, randomizes the position of the drive train, and uses the resultant position of the mechanism to trip an electrical switch.