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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.
The basic design of an LCD projector is frequently used by hobbyists who build their own DIY (do-it-yourself) projection systems. The basic technique is to combine a high color-rendering index (CRI) high-intensity discharge lamp (HID lamp) and ballast with a condenser and collector Fresnel lens , a single color LCD removed from a common ...
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 .
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.
Muybridge's own Zoopraxiscope (1879) was an early moving image projector and one of several inventions made before the breakthrough of cinema in 1895. [citation needed] In 1895 Auguste and Louis Lumière were developing the Kinora simultaneously with the cinematograph. While cinema proved to be an enormous success, the Kinora became a popular ...
Vitascope was an early film projector first demonstrated in 1895 by Charles Francis Jenkins and Thomas Armat. They had made modifications to Jenkins' patented Phantoscope, which cast images via film and electric light onto a wall or screen. The Vitascope is a large electrically-powered projector that uses light to cast images.
By the beginning of 1896, Edison was turning his focus to the promotion of a projector technology, the Phantoscope, developed by young inventors Charles Francis Jenkins and Thomas Armat. The rights to the system had been acquired by Raff and Gammon, who redubbed it the Vitascope and arranged with Edison to present himself as its creator. [98]
In some movie enthusiast's home cinemas, this idea can go as far as completely recreating an actual small-scale cinema, with a projector enclosed in its own projection booth, specialized furniture, curtains in front of the projection screen, movie posters, or a popcorn or vending machine with snack food and candy. More commonly, real dedicated ...