Abstract: Apparatus for use both as a platform for drum-set performances and as a carrier for such a set. The apparatus consists of a rectangular bottom section with two or more side members hinged thereto for raising to a vertical position or lowering to a horizontal position. Castors are attached to at least two of such side members so that when they are raised, the castors extend downward from the bottom section, and when lowered, the castors are retracted above the bottom section. With the side members raised, the drum-set can be placed upon the bottom section, and the entire unit rolled, or carried by provided handles. With the side members lowered, the drum-set can be placed upon the bottom section and side members, and the apparatus used as a performance platform.

Abstract: This liquid recirculation system is particularly suitable for flammable solvents since the liquid is pumped by an air powered pump. The system has a solvent tank with a sink mounted on top of it for drainage into the tank. A centrifugal liquid pump is immersed below the liquid level in the tank for pumping liquid to a spout over the sink. A centrifugal air turbine is mounted above the liquid level for driving the pump. The liquid pump and air turbine have identical housings at opposite ends of a tubular housing. A drive shaft mounted in bushings or bearings at the ends of the tubular housing connects impellers in the turbine and pump. Each impeller is a flat disk with a plurality of flat upstanding blades with a substantially larger number of blades on the turbine impeller than on the pump impeller. Air enters the turbine tangentially and is discharged through an outlet on the top of the turbine.