A correcting lens for use in the formation of a color television picture tube screen that is excitable by an electron beam comprises a plurality of individually contoured elements that extend from a point common to all elements to an edge of the lens. Adjacent elements are separated by boundaries and all boundaries extend radially outward from the common point. Each element is individually contoured to direct light onto predetermined paths of the electron beam toward a similarly shaped correspon...

A correcting lens for use in the formation of fluorescent dots on a color picture tube, which has its effective surface divided into a plurality of sections each of which consists of a flat or curved surface as designated and at least one of which has borderlines of discontinuity in at least two directions.

A semiconductive device and a method for producing the semiconductive device, wherein random defects or inaccuracies in precise registrations of certain patterns are compensated by the introduction of selected impurities. The selected impurities bring about changes in the electrical characteristics of those portions of the semiconductor affected by the random defects or registration inaccuracies so as to prevent them from causing malfunctions in the completed devices.

An error correcting and controlling system having syndrome generating means for generating syndromes of data to be checked and memory means for storing error bit positions in which system the syndromes form addressing inputs to the memory so that the error bit position information stored in the address positions corresponding to each syndrome in the memory may be read out and processed for the purposes of error detection and correction. As a result, the check circuits of the present system have ...

A correcting device for a typewriter comprises a mount for fixedly mounting the device on the typewriter, a cover member slidably supported from said mount, a cassette containing rotatable feed and take-up spools for feeding and winding up, respectively, type correcting strip, said cassette removably supported from said cover member, said cover member and said supported cassette being moveable on said mount between operative (correcting) and inoperative (normal typing) positions. Ratchet teeth a...

An error checking and correcting device for providing group error detection in addition to single error correction and double error detection in a codeword transmitted through a modular communication channel is disclosed. The codeword comprises a plurality of data bits and a plurality of check bits. The modular communication channel comprises a plurality of modules in each of which a group (or cluster) of bits are transferred in parallel. In the preferred embodiment, the code word contains 40 bi...

A correcting device for a golfer's stance comprises a clamp portion which is fastened across the shank of a golfer's shoe, a flexible band for strapping about the lower leg of the golfer above the shoe carrying the clamp portion, a rigid strip member pivoted at its lower end to the clamp portion for fore and aft rocking movement and a pocket in the flexible band in which the upper end of the strip member is held. The device requires the golfer to maintain proper ankle posture during backswing an...

The corrected values to compensate for errors in instrumental levelling of a theodolite and similar instruments are found by determining angles of elevation and/or horizontal directions, measuring the instrumental levelling errors, and calculating the error free values of the instrument.

A circuit for storing data in a random access memory containing one defective bit per word. A separate read-only memory device or programmable logic array is provided to produce an interrupt bit whenever a memory location containing a defective bit is addressed, where a defective bit is defined as one that is stuck at 1 or stuck at 0. If an interrupt bit is generated the data word is read out from memory and compared to the original. If an equality exists, nothing further is required. If there i...

An error correction system for a typewriter in which a silent type action with a blank type face is operatively connected and synchronized to initiate a backspace action and elevate and feed an error correction ribbon in advance of the striking of the blank type face against the space wherein an error was printed. Thus, to obliterate an error and type in a correct character, an operator need only perform two operations; depress the error key and the correct character key. Further, in accordance ...