Abstract: A base running training device facilitates the teaching of proper base running techniques in the game of baseball. The device includes a plurality of bases configured for positioning on a baseball diamond. Each base comprises an incoming edge transverse to an outgoing edge. Base indicia is positioned on each of the bases demarcating a section of an associated one of the bases defining a desired area to be contacted by a player when playing baseball on the baseball diamond.

Abstract: A self-contained, self-propelled air-conditioning system is provided for supplying air to structures, such as aircraft on the ground at airports. The aircraft are of the type having an inlet duct for conveying the air through the structure. The system includes a suitable truck having a frame or chassis mounted on wheels. The system also includes a diesel engine separate from the engine of the truck mounted on the chassis for supplying mechanical energy and an electrical generator mechanically connected to the diesel engine for changing the mechanical energy into electrical energy. A ventilation system is mounted on the frame and is electrically connected to the generator for moving air from the ambience to the inlet duct. A pair of independent refrigeration systems, each including a compressor, are mounted on the frame. The compressors are electrically connected to the generator. Each refrigeration system cools the moving air independently from the other refrigeration system.