{{Short description, System for projecting stereoscopic motion pictures Teleview 1922

Teleview was a system for projecting stereoscopic motion pictures invented by

Laurens Hammond Laurens Hammond (January 11, 1895 – July 1, 1973) was an American engineer and inventor. His inventions include the Hammond organ, the Hammond Clock Company, Hammond clock, and the world's first polyphonic musical synthesizer, the Novachor ...

, best known as the inventor of the

Hammond organ The Hammond organ is an electric organ invented by Laurens Hammond and John M. Hanert, first manufactured in 1935. Multiple models have been produced, most of which use sliding #Drawbars, drawbars to vary sounds. Until 1975, sound was created ...

. It made its public debut on 27 December 1922 at the Selwyn Theatre in

New York City New York, often called New York City (NYC), is the most populous city in the United States, located at the southern tip of New York State on one of the world's largest natural harbors. The city comprises five boroughs, each coextensive w ...

, the only theater ever equipped with the system. The program included several short films, a live presentation of projected 3D shadows, and the 95-minute feature film ''M.A.R.S.'' (or '' The Man From M.A.R.S.''), later re-released in 2D as ''Radio-Mania''. Teleview pioneered the

alternate-frame sequencing An active shutter 3D system (a.k.a. alternate frame sequencing, alternate image, AI, alternating field, field sequential or eclipse method) is a technique for displaying stereoscopic 3D images. It works by only presenting the image intended for ...

method of stereoscopic 3D projection. The basic principle had been patented as early as 1897, but the improved Teleview implementation was the first to be presented to the public. Left-eye and right-eye films were run through a pair of interlocked projectors with their shutters operating out of phase. Each shutter was three-bladed, so that each pair of film frames was projected three times (i.e., left-right-left-right-left-right) before the mechanisms moved the next pair of frames into position. At the minimum 16-frames-per-second silent film projection speed, this resulted in a minimum of 48 flashes per second per eye, eliminating the severe flicker that fatally flawed earlier systems in which the left-eye and right-eye frames alternated on a single strip of film projected at twice the normal rate. Each theater seat was equipped with an attached viewing device supported by a gooseneck stand. It contained a rotary shutter synchronized with the projector shutters, so that each of the user's eyes saw only the images intended for it.

Persistence of vision Persistence of vision is the optical illusion that occurs when the visual perception of an object does not cease for some time after the Light ray, rays of light proceeding from it have ceased to enter the eye. The illusion has also been descr ...

made both views appear to be uninterrupted and a normal fully stereoscopic image was seen. Hammond's system won praise, but because of the high cost of installing the equipment, and the inconvenience of having to peer through the unwieldy viewer, it disappeared completely after this lone engagement ended in early 1923.Zone, Ray (2007). ''Stereoscopic Cinema and the Origins of 3-D Film, 1838-1952'', University Press of Kentucky, pp. 107-109. The alternating image method enjoyed a revival after the advent of

optoelectronic Optoelectronics (or optronics) is the study and application of electronic devices and systems that find, detect and control light, usually considered a sub-field of photonics. In this context, ''light'' often includes invisible forms of radia ...

shutters in the 1970s made it more practical. Modern LC shutter glasses are used for viewing projected 3D films in some theaters, as well as

3DTV 3D television (3DTV) is television that conveys depth perception to the viewer by employing techniques such as stereoscopic display, multi-view display, or any other form of 3D display. Most modern 3D television sets use an active shutter 3 ...

video and stereoscopic computer graphics.

References

External links

"The Chopper," article about Teleview by Daniel L. Symmes''Radio-Mania'' at IMDB Scientific American, Vol 128, n1, page 5, January 1923
3D cinema Motion picture film formats

See also

References

External links