Abstract: A screen structure including the first, second, and third screens, and a hall structure in which a table, a chair, a staircase, and a serving passage are configured in one structure. Multiple tables and chairs are disposed in one viewing direction of the first screen on a front and each table and chair are configured in each staircase structure, the serving passage is configured on a front end of each table, the first screen is provided on the front of the viewing direction of the multiple tables, and the second and third screens are configured in left and right directions of the multiple tables, respectively and a screen size is configured so that a horizontal viewing angle is 180° or more and a vertical viewing angle is 100° or more, including a local illumination that limitedly illuminates the top of the table at an upper end.

Abstract: A device for operating a discharge lamp of the alternating current operating type has a high pressure discharge lamp with a silica glass discharge vessel in which a pair of opposed electrodes are located and on which a trigger electrode is located, a feed device which supplies an alternating discharge current to the high pressure discharge lamp, the feed device having a starter circuit, an inverter circuit with at least two switching devices; a coil which is located downstream of the inverter circuit and is series-connected to the discharge lamp; and a control element which produces on/off driving in alternation with a dead time, and in which the inductance of the coil is at most 210 ?H.

Abstract: An image projecting system for mounting in a hidden location such as a ceiling or a piece of furniture such as a desk. The system includes an image producing apparatus and a plurality of optical components. At least one of the optical components is a mirror that can move between two positions. In the first position the mirror is flush with the ceiling or the desk so that the system is hidden from view. In the second position the mirror is at an angle to the ceiling or the desk so as to project an image externally of the hidden location and onto a screen or other surface.

Abstract: A film slide projector has a rail which engages a carousel in a complementary manner, such that a surface of the rail contacts a surface of each film slide in the carousel. Misoriented film slides are moved by the surface of the rail to expose a portion of such misoriented film slides outside of respective slots of the carousel to indicate such misorientation. Film slides having a predetermined proper orientation are completely contained within respective slots. The predetermined proper orientation of each film slide is determined by a cut-out portion capable of engaging the rail. Alternatively, a carousel may have walls forming slots with a rectangular cross-sectional cylindrical element protruding from a wall to cause misoriented film slides positioned thereupon to have a respective portion thereof extending through a respective open aperture to indicate misorientation.

Abstract: A drum-type slide magazine having a compartment body (11) which surrounds a magazine hub (1) and includes a series of radially extending compartment walls (15) to form slide compartments (17). The compartment body (11) is designed as a body separate from the hub (1) which is fixedly connected with said hub (1) by a connecting element (37).

Abstract: The device is provided with a lever which is pivotally mounted at one end and is urged in the downward direction by a spring, a slide-carrying shoe being attached at the free end of the lever. The lever has an upwardly curving centre portion which rests on a roller mounted on a disc driven at half-speed by a motor. The device also comprises a slide guide consisting of two prismatic rails, one of which is stationary, while the other is secured to a carriage mounted displaceably in the plane of the slide and capable of being pulled towards the stationary rail by means of a spring. There is a coupling pin on the carriage which is engaged with a control cam provided on the lever-driving disc, the said cam being designed in a manner such that the movable prismatic rail is pulled back only during the downward movement of the slide shoe which moves between the prismatic rails, the said slide being otherwise pressed against the stationary rail under the action of the spring.