terminals 22 mounted in the wall of the enclosure 12 the cluster of rods forms a cylindrically arranged heater the cluster of rods 16 is surrounded in spaced relation thereto by a cylinder 24 of insulating material this cylinder being witin and also spaced from the wall of the enclosure 12 end caps 26 close the ends of the cylinder and have central openings to receive the conveyor tube with clearance around the tube to permit both rotational and axial movement of the tube the downstream end of the tube 6 has a cylindrical extension 28 fig4 surrounding the tapering end 30 of the tube this tapering end has a spiral rib 32 therein forming in effect an extension of the rib 15 the extension 28 and thus the delivery end of the tube is supported by rollers 34 in a yoke 36 mounted on the end of the enclosure 12 these rollers permit rotation of the conveyor tube during delivery of material to the compacting container these rollers also permit axial movement of the tube past the rollers since the tube is rotating as it is moved axially at the upstream end of the conveyor tube a similar yoke 50 carries rollers 52 engaging a cylindrical end 54 on the tube this yoke is supported on a track 56 by a roller 58 for movement with the tube as it is moved axially this yoke is a part of a carriage 60 fig2 supported on rollers 64 on a bracket 66 mounted on the enclosure 12 in addition to the supporting rollers 64 the bracket carries vertically positioned rollers 68 which engage on opposite sides of a rack 70 mounted on the carriage this rack is engaged by a driving pinion 72 by which the tube.