Abstract: Features of this apparatus include a carrier ring with attached concentrically rotating pistons which tangentially couple forces from expanding gasses to a power transfer means, a rotating head with windows to allow piston passage, fuel admittance and exhaust ports to provide fuel intake and combusted gas removal without using reciprocating action, a power transfer means to couple power from the rotating pistons to a power output shaft, a means of simultaneous fuel admittance and exhaust gas removal, a unique sealing apparatus, and a balanced firing arrangement where two or more pistons symmetrically arranged with respect to their axis of rotation are simultaneously forced by expanding gases to rotate about their center of rotation in a concentric fashion. These features enable the apparatus to utilize maximum torque through the entire power stroke, do not require reciprocating motion, eccentric piston surface motion or angular deflection.

Abstract: Method and apparatus for inspection similar articles by first passing an ideal sample article through the field of view of a scanning array, generating a train of pulses corresponding to the image falling on the scanning array by sequentially interrogating each sensor in the array in response to a clock frequency, selecting discrete pulses from the train of pulses which are indicative of the characteristics of the sample article, and preferably pulses indicating perturbations, storing data identifying the selected pulses in a sample memory, sequentially passing other articles to be inspected past the scanning array and similarly generating and storing the identification data for selected characteristics pulses in an object memory, and comparing the stored data in the sample and object memories for correspondence between the data within preselected tolerances to determine correlation, or the absence of correlation, between the same article and each article to be inspected.

Abstract: A train of pulses introduced into a filter-discriminator circuit is processed therein, the amplitudes of adjacent pulses in the input train being compared against one another deriving an output signal from that comparison whose amplitudes equal the differences in amplitude between adjacent pulses. Adjacent pulses in the train of like amplitude, produce only low amplitude transient signals that are mostly blanked out by circuitry within the discriminator. By connecting a second filter-discriminator circuit in series with the first, the output therefrom will produce a signal having peak or spike pulses therein whose amplitudes equal the double derivative of unlike pulses in the train of pulses. The output peak of spike pulses can then be used as trigger pulses keying timer and associated circuitry.