Abstract: A method of reading selected ones of an array of data frames from a microfiche medium substantially without errors attributable to misalignment of the frames. The method, which utilizes a microfiche reader-printer in adjusting for misalignment of the frames, includes the steps of determining the average distance between the frames along a first selected axis (e.g., the X-axis) of the array, and using said average distance in positioning the frames along the axis for reading. The frames are separated from each other by a predetermined nominal distance along the axis. The average distance is determined by dividing the distance between the outermost frames along the axis (the distance between the outermost frames being expressed in terms of the number of stepper motor steps needed to traverse said distance) by one less than the number of frames along said axis to produce a quotient, and adding the quotient to the predetermined nominal distance.

Abstract: The microfiche reader printer has multiple format capabilities. A lens support holding one lens for each format is slidable to position a lens into the light path. Positioning of the lens support closes or opens switches which direct a logic circuit to cause a controller to drive the microfiche holding platen in a certain manner dependent on the format. Copying utilizes a rotating xerographic drum. The platen is driven by stepper motors having a digitized sinusoidal input for microstepping drive for constant velocity drive during copying where the movements of the platen and the drum must be coordinated. The platen also takes a half frame back step before printing so that it can accelerate forward over the half step forward to reach constant velocity during scanning of the frame.

Abstract: Radiation is partially blocked by a pointlike absorber to establish a patterned flux whose intensity distribution is a function of source geometry. The flux strikes a receptor having a proper contrast to spatial frequency characteristic to map an image that is topologically equivalent to the source at an acceptable level of contrast and acuity.Apparatus is disclosed that is capable of practicing the invention in the X-ray and light regions of the electromagnetic spectrum.

Abstract: A game device which includes a pair of rigid strip members such as planks, each carrying at least two upwardly projecting loop parts. With the strip members placed in parallel fashion upon the ground two or more players stand upon the strip members, grasping the bight of the loop parts with each hand. The players pull upwardly on the loop parts, causing the strip members to be held against the feet, and walk or shuffle the strip members across the ground.