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machine for feeding coal or other solid fuel into a furnace, usually supporting the fuel during combustion. A good stoker also supplies air for combustion and regulates the rate of burning and, in large installations, disposes of the ashes. Use of stokers affords substantial fuel savings over hand firing. Fuel may be fed into the furnace on a moving chain grate or, for small units (even some for home heating), by a moving screw. Power for running a stoker is usually furnished by an electric motor, and control of combustion is achieved by variable speed or intermittent drive.