through that opening onto the immediately subjacent upper circular track between adjacent pusher elements 44 as noted above the movement of the rotating cylinder 36 and thus the pusher elements 44 is synchronized with the movement of the flights of the introduction conveyor 22 once on this uppermost circular track the containers 26 then move around that track until they encounter the opening and ramp 46 down to the next lower track and then proceed through the heating chamber while in that heating chamber which is enclosed by the cylindrical segments 14 and 16 the containers are subject to a heating fluid such as steam introduced through the conduits 18 and 20 the steam effects heating of the interior of the heating chamber and thus of the containers that are circulating through it as shown in fig1 the heating chamber housing encloses the upper portion of the overall apparatus with a lower portion including a number of the circular tracks 30 outside those cylindrical housings 14 and 16 the heated fluid such as steam is contained in the enclosed portion because of the heat tending to rise as the steam may condense on the structures it may drain to receptacles not shown below the apparatus as the cylindrical containers 26 continue in their process through the apparatus they ultimately proceed through an opening in one of the tracks at the lowermost portion of the heating chamber housing portion 16 to the next.