Abstract: Present parameter value indicators are wasteful of space and expense and have parallax error if viewed at an angle. This invention is a vertical strip bargraph comprising separately illuminated squares of different colors to indicate values of the parameter without parallax error and economical of space and expense.

Abstract: An indicator dial having at least one scale thereon and having at least one illuminable indication area for providing a visual signal of a physical function, wherein the dial comprises a thin transparent plate having an opaque dye coat on one face thereof with at least one area free of the opaque dye coat and having a translucent dye coat of contrasting color in the area, and the scale being on the side of the plate facing a viewer, whereby the scale is visible at all times, but the indication areas are visible to the viewer only when illuminated from behind the dial. The dial is made by applying the dye coats and scale markings in sequential operations by use of a screen printing process.

Abstract: An indicator system for a merchandise display rack indicates a related article as a signal is energized indicating the position of the merchandise on the rack. The signal is timed. Other signals give different indications in the same way and cancel prior indications not appropriate to the current signals indicated.

Abstract: An instrument panel including a lighting circuit, lights and signal indicators mounted on the instrument panel in a manner for ease in assembly and convenience for servicing. Indicator lights on the instrument panel will signal various operating conditions of the engine and the tractor. A cable is connected between the lighting circuit which is formed by a printed circuit on a circuit board and a sensing circuit which senses the sensed conditions of the engine and tractor. Light bulbs are positioned in compartments which are covered by windows carrying a symbol to indicate to the operator the operating condition of the tractor. The wiring is simplified by incorporating the connecting wires in a cable and a connector with a plug and socket arrangement for connecting the light circuit and sensor circuits for a simplified assembly and repair of the system in general.

Abstract: The invention is an emergency illumination apparatus for use in areas where the presence of gases, vapors, dust, or combustible matter makes the use of conventional apparatus hazardous. The apparatus has a front compartment and a rear, explosion proof compartment that is separated, from the front apartment, by a divider wall. This divider wall has sealed light sockets on the front compartment side. Furthermore, the rear compartment has sealed electrical connections to at least two independent power sources.

Abstract: A lighting display of relatively thin proportions producing a visual image of substantial depth by creating multiple reflections of light sources and objects within a narrow space. The space is defined by a vertical, rear mirror plate and a front one-way mirror which appears substantially transparent from a viewer area. Images from the light sources in the spaces are repeatedly reflected back-and-forth between the front and rear mirrors.

Abstract: A signal lamp comprises a housing defining two openings of corresponding overall shape and size, and an electrical light source mounted in the housing to provide a light beam which leaves the housing by way of one of the openings. The lamp also comprises translucent members, each of which corresponds in overall shape and size to the shape and size of each of the two openings, and retaining nibs for retaining any one of the translucent members in the first opening, so that the light beam passes through that translucent member when leaving the housing, and for retaining any one at least of the translucent members in the second opening. At least one of the translucent members includes a color filter so that when that translucent member is fitted in the first opening the color of the light beam is modulated by the color filter.

Abstract: A low energy sign contruction is illustrated for illumination of signs of the type having translucent illuminated faces. An opaque sign border is bridged by a reflector extending generally parallel to the illuminated face and having a truncated sawtooth profile. For single sided signs, one set of sawtooth points is truncated; for dual sided signs, both set of sawtooth points are truncated.Bayonet mounted lighting sockets are mounted at apertures in the respective truncations and utilize the metallic reflective surface as one side of a low voltage (10.5-volt) AC circuit. The reflector forms a cooled heat sink mounting the bulbs as well as a supporting matrix. The lamps, as mounted to this supporting matrix, are typically spaced at distances which do not exceed twice the distance of the lamp filament to the translucent face. By the expedient of using 14-volt lamps, prolonged lamp life with low energy illumination results.

Abstract: An intelligence display apparatus comprising:(a) an envelope comprising a substantially transparent faceplate:(b) illumination means for directing light toward said faceplate:(c) an intelligence selection element disposed between said faceplate and said illumination means, said selection element comprising first regions substantially transparent to said light and second regions substantially opaque thereto, said first and second regions having respective widths in the ratio of about 6:7 to about 8:9;(d) an intelligence storage element comprising a plurality of discrete and different sets of intelligence, said storage element being disposed between said selection element and said illumination means, said sets individually comprising a plurality of bits respectively embodying different portions of said intelligence, such that said bits of each set collectively comprises a composite of the intelligence of said set, each one being totally opaque, totally transparent, partially opaque and partially transparent to

Abstract: A plurality of light boxes adapted to be transported and stored in a knocked-down and disassembled condition to be readily assembled, set up and connected together, with a divider between adjacent light boxes and with a front translucent panel for each light box which is lit up by lights within each light box. Each translucent panel having a flange, with the flanges of the adjacent panels being held in abutting relationship by clamping means which eliminates mullions therebetween and with the clamping means so constructed to eliminate and/or reduce the shadows on the panels at such junctures. The adjacent panels presenting when lighted a continuous surface where the dividing lines between adjacent panels are substantially imperceptible.

Abstract: A display sign is disclosed for displaying printed matter on a backlighted poster or the like. The sign includes a display case defining a first compartment containing a light source, the display case having a front opening for the transmission of light therethrough. A closure panel is adapted to cover the front opening, the closure panel having a central transparent face panel. A concave translucent diffuser panel is located between the face panel and the light source so that the curvature of the concave diffuser panel extends toward the light source to define a second compartment between the diffuser panel and the face panel. VELCRO fastening means locate and retain the poster in the second compartment spaced between the closure panel and the concave diffuser panel. Vent openings communicate with the second compartment for the circulation of air around the poster.