Abstract: This invention relates to kettles used for the melting of tar and/or asphalt. The kettle is normally mounted on a base frame having an axle and tires for towing behind a truck, but the kettle may be stationary or semi-permanent. The flames and hot gases from a gas burner flow through tubes in the kettle to melt blocks of tar. The melted tar is then pumped by a motor driven pump from the kettle to the surface where it is being used. To add blocks of tar to the kettle for melting, a double rotating cylinder is used so that the melting tar is not exposed to atmosphere. When the cover is raised so that a first opening in an outer cylinder is exposed to atmosphere, a block of tar is inserted. The inner cylinder has an opening in line with the first opening of the outer cylinder. Thereafter upon closing the cover and rotating the inner cylinder, the block of tar falls from the inner cylinder through a second opening in the outer cylinder into the kettle.