Abstract: A pneumatic jack includes at least a base platform and a top platform. The base platform is configured to be supported by a plurality of pneumatic jets. The pneumatic jets are configured to raise and lower the base platform and endow the apparatus with the ability to hover. An air bladder, with internal baffling, is positioned between a middle platform and the top platform. As the air bladder is inflated, the top platform rises relative to the other platforms.

Abstract: On-board apparatus for visually indicating the efficiency of the spark plugs and ignition wires of an internal combustion engine includes a capacitive clamp attached to the insulated ignition wire of each spark plug of the engine, preferably as close to the spark plug as possible. The current derived by the capacitive clamp is fed through a knock-down resistor to reduce the voltage fed to a conditioning circuit. The conditioning circuit provides a positive pulse substantially proportionate to the intensity of the signal through the conditioning circuit. The resulting signal is then fed to a time delay circuit to provide a relatively smooth signal to a bar graph. The time delay circuit includes high and low sensitivity modes for user selection to generally monitor system efficiency or to detect misfires. An adjustable gain circuit allows the bar graph to be calibrated to operate at a preselected level when the engine idles.