Abstract: An apparatus for measuring the percentage of moisture content and weight of a sheet-like object has a pair of metal boxy sections for providing a cavity resonator with openings, defining a gap interposed therebetween. In measurement, the sheet-like object is inserted in the gap. The percentage of moisture content of the sheet-like object is measured by detecting the variable resonant voltage of a microwave signal introduced into the cavity resonator. Weighing of the sheet-like object is measured detecting the variable resonant frequency of the microwave signal introduced.

Abstract: An improved instrument for measuring and indicating the load experienced during a cycle of a machine, as a reciprocating press. A piezoelectric transducer mounted on the press provides a signal which is proportional to the press frame deformation during operation. In one aspect of the instrument, the signal from the transducer is amplified and compared with reference voltages representative of excessive machine load and a minimum load level. During each cycle of operation either a NORMAL, UNDER or OVER (LOW, OK or HI) indicator is actuated. The NORMAL indicator remains on so long as the machine load is within the selected limits represented by the reference voltage. A safety circuit stops the press when an excessive load is experienced. In another aspect of the instrument, the reverse load experienced by the machine is detected.

Abstract: A method and apparatus for delivering energy to an oscillatory system in a signal transmitter to maintain the system in a state of oscillation. A component of the oscillatory system that affects the oscillation frequency is influenced by the magnitude of a measured condition which is to be transmitted by the signal transmitter. The oscillatory state of the system is sensed through a signal path, and energy is delivered to the system through substantially the same signal path, said energy being delivered in the form of pulses at time intervals longer than a whole period of oscillation of the system to maintain the system in a state of oscillation.

Abstract: An alarm activating device is provided for closing a normally open circuit upon release of body pressure upon the rearward wall of the device, comprising a first, second, and third plate supported respectively in substantially parallel alignment behind a mounting plate, which mounting plate is adapted to be secured behind a belt in close proximity to a body, the first and third plates being spaced-apart and movable together from a position wherein one contacts the second plate, to a position where the other contacts the second plate, including means for applying constant positive pressure to the first plate opposite the second plate, and further including a first and a second contact in series circuit relationship, supported adjacent one another in alignment on the first and second plates.

Abstract: An intrusion sensor uses thin film piezoelectric transducers to sense nea mechanical vibrations. A hose-like sheath contains a pair of insulating strips which carry conductive leaves on their outer surfaces. A series of longitudinally arranged segments of a thin film piezoelectric material are coupled to the leaves to provide signals representative of impinging mechanical vibrations. Since adjacent ones of the thin film segments are alternately polarized, signals are created only when the vibrations are nearby. Greater sensitivity to nearby vibrations is assured when each of the segments is fabricated from several layers of the thin film piezoelectric material.