Abstract: The present invention employs a material mass to respond to forces, such as gravity, and the material mass is secured through an intermediate beam, or arm, to a wire coil. The intermediate arm has upper and lower shafts secured thereto, which, when mounted in some form of bearing means, permit the arm, or beam, to rotate, thereby rotating the mass and the wire coil, in response to forces applied to the material mass and forces applied to the wire coil. The coil is formed to pass through a narrow gap between a pair of permanent magnets whereby the coil is subjected to a high density magnetic flux.

Abstract: The present invention provides a two-way sound transducer system, including amplification circuitry within an ear-muff type attenuator, to enable the user to listen to principally voice communications (although other forms of sound can be transmitted) from a remote location and in response thereto answer a communication by talking in a natural voice, irrespective of the total surrounding noise present at the location of the user.

Abstract: The present device has a three-piece spring-loaded main housing with a cavity therein, and an accelerometer assembly disposed in said cavity and arranged therein to be held between a plurality of O-rings located on both ends thereof. One of said pieces of said main housing comprises a plastic tip. The entire main housing is located within a sleeve and is spring-loaded to force said plastic tip against the rotating shaft whose displacements are being monitored.

Abstract: The present device provides a pressure-responsive transducer which fits externally onto a fluid carrying pipe, or conduit, and which transducer contacts the pipe at a plurality of tangential points. Said tangential points are located in a plane which lies substantially orthogonally to the axis of said fluid carrying pipe. In addition, the present system employs a circuit which is connected to said transducer and said circuit is particularly designed to eliminate background noise and spurious signals.

Abstract: The present circuit is primarily designed to be employed with a transducer which generates a signal in response to some physical phenomenon and said present circuit provides a direct current signal which is an excellent representation of the intensity of said physical phenomenon. In addition said circuit has excellent response over a broad frequency range as related to said physical phenomenon and has high signal to noise ratio. The present circuit principally utilizes a low pass filter which provides a relatively flat response at all frequencies below one-half of the carrier frequency as well as employing a notch filter designed to filter signals at twice the carrier frequency. The twice filtered signal is a low ripple direct current signal having the earlier described characteristics.