Abstract: A posting device comprising transparent elements fastened parallel to one another to a mounting panel is disclosed. The elements and the panel are preferably made of plastic sheet, to make them flexible, resistant to bad weather and washable. Each element is U-shaped with equal or unequal legs or walls, elastically tilted toward one another, meant to receive strips containing the information to be posted. Adjacent elements are mounted close to each other so that a strip inserted into one of the elements becomes a "captive" thereof. A method to operate the device is also disclosed. It involves lifting the upper wall of an element, inserting the strip containing the information to be posted into the space between the two walls of the element and releasing the lifted wall. Removing the strip is done in an essentially similar fashion. The device can be used to advantage wherever there is a need to post constantly new information.

Abstract: The display device includes a housing having a viewing opening, an angularly disposed light transmitting mirror dividing the housing into rear and front display compartments located at right angles to each other, and lamps for illuminating each of the display compartments. One of the lamps is sequentially and alternately brightened, while the other is simultaneously dimmed, by a control including a pair of photocells which control the electrical power to each of the lamps in response to the amount of light falling thereon, a light source adapted to emit light onto both of the photocells and an opaque disc which is interposed the light source and the photocells and is slowly rotated by a motor. The disc includes a window portion which is arranged to sequentially and alternately gradually vary the amount of light from the light source reaching each of the photocells during the rotational cycle of the disc.