Abstract: A reliable indication of temperature-compensated pressure is provided from each of the wheels of a vehicle to an operator within the vehicle. A piezoresistive transducer bridge is supplied by a constant current source in one embodiment, and by a voltage of constant amplitude in another embodiment. Voltage to the bridge is reversed on a periodic basis. The use of constant current enables compensation for temperature-induced drift in transducer bridge output. The use of constant voltage enables compensation for ambient temperature, and provides an absolute, rather than a relative indication of pressure or "flatness" within the tire. Voltage polarity reversal permits compensation of amplifier offset voltage. Energy is transmitted to an from the wheel by means of a tuned circuit which is excited by a primary coil when the vehicle's engine is running.

Abstract: An improved magnetic pick-up device and marker for use in games includes a rectangular ferromagnetic member having a length substantially greater than width. The ferromagnetic member is fixedly received in a rectangular socket affixed to an elongated handle. The handle with the ferromagnetic member affixed thereto may then be used to retrieve a circular marker formed of translucent material and having ferromagnetic properties after the marker has been utilized as an indicator in a game.