NOVELTY - Rotary composter mechanism (A) comprises: a base frame; a fuselage member having a longitudinal axis, an entrance portion and an exit portion, and an interior chamber; many interior longitudinal slats positioned in the interior chamber; a drive mechanism attached to the base frame and operatively connected to the fuselage member; an entrance cap rotatably coupled to the fuselage member, and fixedly and removably attached to the base frame; and an exit cap (91) rotatably mounted to the fuselage member and attached to the base frame.    USE - (A), (B1) and (C1) are useful for composting materials (all claimed).    ADVANTAGE - (A), (B1) and (C1) permit economical and large-scale composting mechanism, and are more resilient to extensive wear. The longitudinal slats: increase the R-value of the heat transfer from the interior chamber portion to an outer surface of the fuselage member by a value of R-4, hence providing better heat retention; and provide better gripping of composting materials.    DETAILED DESCRIPTION - Rotary composter mechanism (A) comprises: a base frame having first and second end portions; a fuselage member having a longitudinal axis, an entrance portion and an exit portion, and an interior chamber; many interior longitudinal slats positioned in the interior chamber, where the interior slats have a circumferential spacing sufficient so as to house composting material; a drive mechanism attached to the base frame and operatively connected to the fuselage member for rotation of the fuselage member with respect to the base frame; an entrance cap rotatably coupled to the fuselage member, and fixedly and removably attached to the base frame at the first end portion; and an exit cap (91) rotatably mounted to the fuselage member and attached to the base frame at the second end portion, where the entrance or exit cap is operatively connected to the base frame so as to allow a longitudinal change in position between the entrance and the exit cap. INDEPENDENT CLAIMS are also included for:    (1) a method of composting material comprising: providing pre-composting material through an entrance passage on a fixed entrance cap; transferring the pre-composting material into an interior chamber of a fuselage member, where the entrance cap forms a portion of the interior chamber; rotating the interior chamber so as to agitate the pre-composting material; providing many longitudinal slats positioned within the chamber region so as to position a portion of the pre-composted material between two adjacent longitudinal slats; providing composting microbes within the interior chamber of the fuselage member so as to position a portion of the microbes between two adjacent longitudinal slats and maintain a portion of the composting microbes in the chamber region as the pre-composting material passes through the fuselage member from the entrance portion to an exit portion; and providing a non-rotating end cap with an exit passage positioned in an upper region of the end cap to allow the composter material (formed from the pre-composting material) to exit;    (2) a rotary composter mechanism (B1) for composting material comprising: a base frame having first and second end portions; a fuselage member having a longitudinal axis, an entrance portion and an exit portion, and an interior chamber; an interior surface comprising many retention chambers operatively configured to house composting material; a drive mechanism attached to the base frame and operatively connected to the fuselage member for rotation of the fuselage member with respect to the base frame; an entrance cap attached to the fuselage member; and an exit cap attached to the fuselage member, where the retention chamber is provided for housing a portion of the composting material while a majority of the composting material passes from the entrance portion to the exit portion, and where the compost material retained within the retention chamber contains microbes for composting (which are provided for the composting material); and    (3) a rotary composter mechanism (C1) comprising: a base frame having first and second end portions; a fuselage member having a longitudinal axis, an entrance portion and an exit portion, an outer metallic layer, an interior chamber, an interior body comprising an inner surface to increase the wear resistance of the fuselage member, where the interior body provides an insulation factor greater than the metallic layer alone; a drive mechanism attached to the base frame and operatively connected to the fuselage member for rotation of the fuselage member with respect to the base frame; and an entrance cap attached to the fuselage member and an exit cap attached to the fuselage member.    DESCRIPTION OF DRAWING(S) - The figure shows a partially exploded view of an exit portion.    Exit cap (91)    Exterior surface (100')    Outer plate (101')    Insulating panel (106')    Exit slot members (130)