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A modern "useless machine" about to turn itself off. A useless machine or useless box is a device whose only function is to turn itself off. The best-known useless machines are those inspired by Marvin Minsky's design, in which the device's sole function is to switch itself off by operating its own "off" switch.
Simulation of a spinning zoopraxiscope An early projector and seats from a movie theater. The main precursor to the movie projector was the magic lantern.In its most common setup it had a concave mirror behind a light source to help direct as much light as possible through a painted glass picture slide and a lens, out of the lantern onto a screen.
The LCD system did not have a light source of its own: it was built on a large "plate" that sat on top of the projector in place of transparencies. This provided a stop-gap solution in the era when the computer was not yet a universal display medium, creating a market for LCD projectors before their current main use became popular.
Turns any surface into a touchscreen with this cool projector.
No need to schlep to the planetarioum; this little projector gives off a seriously cool show right at home. (Photo: Amazon) (Photo: Amazon) This projector-slash-night light has an army of devoted ...
A projector or image projector is an optical device that projects an image (or moving images) onto a surface, commonly a projection screen. Most projectors create an image by shining a light through a small transparent lens , but some newer types of projectors can project the image directly, by using lasers .
The lamp is turned off, or in some cases, shuttered by a light-tight mechanism. The image is focused by changing the distance between the lens and the film, achieved by adjusting the length of a light-tight bellows with a geared rack and pinion mechanism. [18] Electric timer: photographers choose exposure time. The lens is set to its working ...
This mini projector can throw video images onto a wall or projection screen up to 120 inches, while its video quality is sharper and brighter with 900 ANSI Lumens of brightness and an HD ...