NOVELTY - The composter comprises an elongated hollow drum (10), an annular intake end wall, an annular exit end wall, a stationary end plate (62), a feed hopper (20), a drive mechanism, a seal such as a grease layer, a cylindrical screen (24), and a hollow cylindrical extension. The drum has a cylindrical wall that is symmetrical about a horizontal axis and that has an interior space, and axially spaced intake and exit ends, and is mounted for rotation on the axis. The annular intake end wall is fixed to the cylindrical wall, and extends inward towards the axis from a location on the cylindrical wall.    USE - The composter is useful for producing compost from animal carcasses, animal waste, vegetation and garbage, where the compost is useful as a fertilizer.    ADVANTAGE - The composter ensures efficient, economical and simple production of the compost with high reliability and less energy wastage, and is continuous to operate and easy to maintain.    DETAILED DESCRIPTION - The composter comprises an elongated hollow drum (10), an annular intake end wall, an annular exit end wall, a stationary end plate (62), a feed hopper (20), a drive mechanism, a seal such as a grease layer, a cylindrical screen (24), and a hollow cylindrical extension. The drum has a cylindrical wall that is symmetrical about a horizontal axis and that has an interior space, and axially spaced intake and exit ends, and is mounted for rotation on the axis. The annular intake end wall is fixed to the cylindrical wall, and extends inward towards the axis from a location on the cylindrical wall that is adjacent to the inlet end of the drum. The intake end wall is rotated with the drum, and has a side facing the interior space of the drum and a central opening. The annular exit end wall is fixed to the cylindrical wall, extends inward towards the axis from a location on the cylindrical wall adjacent to the exit end of the drum, is rotated with the drum, and has a central exit opening for delivery of a material from the interior space of the drum. The stationary end plate: has an annular marginal area, which overlaps a part of the intake end wall; an inner surface facing the exit end of the drum; an outer surface facing away from the exit end of the drum; and a material feed opening present in a register with the central opening of the intake end wall. The feed hopper is fixed to the stationary end plate placed on a side of the hopper faced by the outer surface, includes a chute that is arranged to deliver the material collected in the hopper through the material feed opening into the interior space of the drum, and is adjacent to the intake end of the drum. The drive mechanism is configured for rotating the drum about the axis. The annular marginal area of the stationary end plate is located on the side of the annular intake end wall that faces the interior space of the drum. The seal is positioned between the annular marginal area of the stationary end plate and a part of the intake end wall that is overlapped by the marginal area, and is present in contact with both the annular marginal area and the part of the intake end wall. The cylindrical wall of the drum includes a first external trunnion adjacent to the intake end of the drum, a second external trunnion adjacent to the exit end of the drum, and first and second pairs of idler rollers that rotatably support the drum. The first pair of rollers is located in a rolling engagement with the first external trunnion. The second pair of rollers is located in the rolling engagement with the second external trunnion. The annular intake end wall meets the cylindrical wall of the drum at a location in axial register with the first external trunnion. The annular exit end wall meets the cylindrical wall of the drum at a location in axial register with the second external trunnion. The external trunnion is restrained against axial movement. The second trunnion is axially moved relative to the second pair of rollers for allowing for axial expansion and contraction of the drum. The cylindrical screen: is connected to and rotated with the exit end wall; is coaxial with the central exit opening in the exit end wall; has a diameter larger than a diameter of the central exit opening; is positioned to receive material delivered from the interior of the drum through the central exit opening; and includes an end opening remote from the central exit opening. The end opening has a diameter equal to the inner diameter of the cylindrical screen. The hollow cylindrical extension is coaxial with the central exit opening, extends into the cylindrical screen from the exit end wall, has a delivery opening present in axial register with a part of the screen, and a diameter smaller than that of the screen. The material delivered from the interior of the drum through the extension falls by gravity onto the screen. The cylindrical wall of the drum further has an inner surface coating composed of a rubber.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic side elevational view of a composter.    Cylindrical drum (10)    Feed hopper (20)    Cylindrical screen (24)    Stationary frame (50)    Stationary end plate. (62)