Abstract: A portable toilet apparatus includes a seat elevating structure; an annular seat structure having an open middle and resting on the seat elevating structure, and including a sack securing mechanism; and a waste collection sack having a closed sack lower end and an open sack upper end removably secured to the annular seat structure with a waste collection sack engagement structure. The seat elevating structure preferably includes an annular bellows having a tubular accordion outer bellows side wall and a tubular accordion inner bellows side wall spaced inwardly from the outer bellows side wall, and an annular upper bellows wall and annular lower bellows wall integrally joined to the inner and outer bellows side walls to define an annular bellows interior space for releasibly trapping air, the upper bellows wall being sized to fit and fitting within the annular seat structure and providing a yielding, resilient cushion effect when the annular seat structure is sat upon.

Abstract: A rotary piston for a rotary piston, internal combustion engine, said rotary piston comprising a plurality of contiguous, convex, arcuate peripheral surfaces which, in combination with the engine housing, define combustion-working chambers. Each of the convex, arcuate peripheral surfaces of the rotary piston defines a convex, arcuate rotor recess having a radius greater than the radius of the arcuate peripheral surface of the rotary piston.

Abstract: A stratified charge rotary combustion engine includes a main fuel injector, a pair of spark plugs and a piot fuel injector. The first spark plug is located upstream of the pilot fuel injector. The second spark plug is located upstream of the main fuel injector and is located upstream of the center of the top-dead-center region of the housing.

Abstract: A rotary internal combustion engine includes a fuel intake port located in the periphery of the rotor housing near the air inlet end of the major axis of the two-lobed profile defined thereby. A rotary valve controls communication between the fuel intake port and a source of gaseous fuel such as natural gas. The valve includes a rotary valve member so that the communication is open between the source and the fuel intake port when rotor pockets are facing the intake port.

Abstract: To take cross-section samples of material discharged from a conveyor, a sample chute has its lower end pivoted about an axis parallel to the direction of travel of the material, and at its upper end a cutter head with a mouth leading down to the chute. The sample chute is swung about its axis from one side to the other so the cutter head traverses the discharge end of the conveyor at constant speed, the cutter head mouth being arranged to receive a sample of the discharged material and having sides which are radial to a point on said axis so that, despite the arcuate travel of the cutter head, a true cross-section sample is obtained.