Transidyne General Corporation

Jan A Vanden Broek

James A Carney

A system for recording the magnitude of a time-varying electrical signal on a chart and for computing the integrals of various segments of the signal, includes operator actuated controls for providing the computer with the integration boundaries on the curve. As the signal is recorded on the chart, the value of its magnitude or its integral is also entered into a memory. To select a boundary the controls are actuated as a point on the recorded curve passes under a cursor. The computer is provided with the manually entered boundary signals and the related magnitude or integral signal at the same instant. To maintain synchronism between the stored signals provided to the computer and the boundary signals, the rate of motion of the chart is detected and used to control the rate of provision of the stored signals' values from the memory to the computer. This allows use of a low cost, variable speed chart drive.

Display and processor for time-varying electric signal

A viewer for observing and measuring the diameter of diffusion rings occurring on immuno-diffusion plates employs a magnifying lens for observing the plate and a baffled back lighting system for illuminating the plate so that light diffused by the plate is visible through the lens against a dark field. A beam splitter supported between the lens and the plate superimposes an image of a pair of illuminated filaments on the image of the plate seen through the lens. Manual mechanism allows the spacing of the filaments to be adjusted by the observer to bring them to the diameter of a diffusion ring. A digital display connected to the adjustment system provides a read-out of the filament spacing and thus the diameter of the immuno-diffusion ring.

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Ann Arbor, MI, United States of America

Jan A Vanden Broek