Abstract: Resonant vibration is employed for imparting oscillations to a stressed wire, cable or metallic strip for the purpose of measuring its tension or for setting the vibrated member at a desired tension. A U-shaped magnetic resonator has an air gap to receive a stressed wire or cable and to impart vibrations thereto, the air gap being of such a width as to permit the received element to vibrate freely at its resonant frequency. The tension of the stressed element can be measured by varying the frequency of the resonator and noting when the condition of resonance exists or the tension of the element may be set by varying its tension while subjected to a steady predetermined pulsating magnetic flux field until the condition of resonance is noted. Either operation is performed in the absence of current flow through the stressed element.

Abstract: The panel comprises a gas-filled envelope including an elongated base plate having a transverse slot at about its center which divides the plate into two portions. Both portions of the base plate are provided with parallel slots in their top surfaces, and two sets of scan anodes are provided, one set seated in the slots in each portion of the base plate. The inner ends of the scan anodes are bent into and secured in the transverse slot. Two sets of scan-display cathodes are seated on the base plate, one associated with each set of scan anodes, and oriented transverse to the scan anodes and forming rows and columns of scanning or priming cells therewith. An apertured insulating cell sheet having two sets of apertures or cells is seated on the cathodes, with each set of apertures arrayed in rows and columns and overlaying a set of scanning cells, with each display cell aligned with a scanning cell beneath it. Two sets of display anodes are provided, one associated with each set of display cells.

Abstract: A cotter pin having a conical circumferential recess is provided for securely attaching extrusions and the like to frame members in business machines and other apparatus, such recess serving to translatably carry a C-shaped spring member as between discrete positions of varying diameters within the recess, insertion of the pin through an aperture formed in the frame member, with a concave resilient washer disposed adjacent the head thereof, into a cylindrical channel formed in the extrusion serving to translate the C-shaped spring to a discrete position corresponding to the smallest diameter of the recess, to thereby permit ready ingress of the pin to a position in the channel wherein the head of the pin has effectuated a yielding action of the resilient washer, release of the pin upon completion of its insertion serving to translate the C-shaped spring to a discrete position within the recess where it is grippably impinged between a larger diametered portion of the recess and the walls of the cylindrical cha

Abstract: A method and apparatus for protecting the sensitive electronic or magnetic circuitry of modern business machines, mini-computers, and the like, while preventing the operator thereof from experiencing any discomfort. A high voltage discharge switch attachable to such a machine is used to discharge an accumulated charge of static electricity from the machine operator's body in approximately one tenth of a second without causing any discomfort.

Abstract: An improved circuit modification method is provided for wire-wrapped electrical back planes such that changes in the back plane circuitry may be accomplished in areas remote from a production facility where wire-wrap equipment and highly skilled technicians may not be available, such method involving the preparation of a slip-on, post-terminal-compatible printed circuit board at the production facility, delivery of the printed circuit board to the remote area, and the slip-on attachment of the printed circuit board onto the post terminals of the back plane by a repairman who may be unfamiliar with the intricacies of the back plane and its wire-wrapped interconnections, said slip-on printed circuit board being inherently provided with whatever guidance may be required by the repairman in effectuating its installation on the back plane.