Abstract: A display device has a disk assembly with a SET position and a RESET position approximately perpendicular and approximately parallel to the intended viewing direction. The disk assembly shows a bright indication in the viewing direction in SET position and a dark indication at the same viewing area in the RESET position. An aperture in the disk allows radiation from an optic fibre to be seen from the viewing direction in SET position and a hood, mechanically attached to the disk assembly occludes such radiation in the reset position.

Abstract: Display element has electromagnetic drive and two rotatable vanes which exhibit a display area to the viewer in ON mode and occlude it in OFF mode. Side walls may be used to prevent viewing the display area from the side in the OFF mode.

Abstract: A light source in a transparent envelope is contained in a sleeve which mounts the light input ends of optic fibres. Liquid coolant is caused to flow between the envelope and the fibres and is then cooled for recirculation.

Abstract: An electromagnetic display device has a rotor rotatable between limiting positions and in said limiting positions to display contrasting faces in the viewing direction. The drive for the rotor uses a permanent magnet mounted on the rotor eccentrically of the rotary axis and a stator core mounted behind the rotor and on a line intersecting the rotor axis and parallel to the viewing direction.

Abstract: Electromagnetically actuated rotatable display element uses low coercivity magnetic core drive through cores running parallel to the rotation axes and magnets on the element outside each end of the cores.

Abstract: A display element has a rotor designed to assume 3 or 4 angular positions to display corresponding panels on a viewing direction. The rotor has a permanent magnet at an angle to the axis. The position of the permanent magnet and rotor are controlled by stationary pairs of pole piece tips adjacent but spaced from each other, located adjacent the locus of the magnet at locations spaced by the angle between adjacent locations.

Abstract: An electromagnetic display or indicator element comprises a disc having a permanent magnet perpendicular to the disc's rotary axis. The disc is controlled by a single high remanence pole piece which has its forward end transversely (relative to the viewing direction) located relative to the disc to exert the main control on the magnet therein and its rearward end located rearwardly of the center of the disc.

Abstract: A magnet operated display or indicator device selectably displays one of two faces of a disk. The disk is stopped in each limiting position by a stop contacting the disk inboard of its edge to another aspect the magnet is offset relative to the pivot axis of the disc to give better starting torques. In another aspect, where a plurality of disks are in columns, the pivot axes are stepped to be parallel but not coaxial.

Abstract: A display device has lever mounted display members with their members on one end movable from exposed to eclipsed position to provide a variable display and permanent magnets on the other end to provide for control of the lever by magnetizable cores located rearwardly thereof. A housing structure accurately mounts both a frame which holds the levers and a rear face which holds the cores in three dimensions contributing to the precision of the magnetic control. The cores are mounted projecting from the rear wall of the housing. The forward ends of the cores may be accurately located again contributing to the precision of the magnetic control. The improvement of the magnetic coil means the energizing coils for the windings must be made smaller and for this and other reasons the device may be made smaller from front to back.

Abstract: A display element comprises a stator housing with a front aperture and a rotor electromagnetically rotatable to assume three or four rotary positions. At each rotary position a different area of the rotor is seen through the aperture. Two or three of the areas of the rotor are translucent. Apertures in the stator housing and registering apertures in the rotor allow the translucent areas to be illuminated by lighting placed to the rear of the stator housing.

Abstract: A thin disk contrastingly colored on opposite sides is rotatably mounted to rotate about its diameter. A permanent magnet on the disk allows the disk to be driven by a pair of reversibly magnetizable cores. One of the cores is bent to provide a stop which limits the rotation of the disk in either direction. The two limiting positions correspond to the display of the contrastingly colored sides in the viewing direction.

Abstract: An electromagnetic display element is controlled by one or more high remanence cores which have control windings. A circuit is connectable to an A.C. outlet and provides to the windings a D.C. pulse in one sense (to switch the display element in one direction) when the circuit is connected to the A.C. outlet. The circuit included a capacitor charged during such connection. The circuit is designed so that, on its disconnection from the A.C. outlet, the capacitor discharges through the winding in the opposite sense and switches the display element in the opposite direction.

Abstract: A display or indicator element has a set of movable and a set of fixed vanes of contrasting colors. Each set of vanes encompasses what is substantially a circle in the viewing direction. The sets of vanes are arranged so that the moving vanes move between a position where they are hidden (in the viewing direction) behind the stationary vanes and a position where the moving vanes occlude the stationary vanes. In such movements each moving vane passes between a pair of stationary vanes. Accordingly, contrasting effects are produced. Preferably the actuation for the movable vanes is electromagnetic.