Projection systems

Scale Map projections can be constructed to preserve at least one of these properties, though only in a limited way for most. Each projection preserves, compromises, or approximates basic metric properties in different ways. The purpose of the map determines which projection should form the base for the map.

Projection systems

The "Cathay Lounge" overhangs two of these bays, and so if the screen is somewhat beyond the footlights, the projection throw is around 90 feet. It may have been smaller. A projection beam 85' x 24' is three and a half times as long as it is wide, which is pretty narrow.

The smaller the picture, the longer the focal length of the projection lens, resulting in a greater depth of focus. That is only one and a quarter times as deep as it is wide, making it far more of a challenge to keep the image on screen sharp and evenly illuminated.

Grauman's Chinese Theatre, Hollywood, California. Auditorium showing position of projection room and 1: Drawing by Kurt Wahlner. Auditorium from the stage, Courtesy of Kurt Wahlner. Sid Grauman, outfitting his Chinese Theatre, had in mind only one thing: The best of everything.

Originally, the projection booth was situated upstairs in the center of what came to be called the "Cathay Lounge. Projection Room, ; photo probably taken during the run of The Gaucho.

From Motion Picture News, February 4.

GIS Commons: A Free eText about Geographic Information Systems

Motion Picture News, Inc. From left to right: Brenkert effects projector ; two pole-mounted follow spots, the upper a Brenkert Type C3the lower unknown; Projection systems 6B Improved projectors with Ashcraft lamphouses.

The booth contained all of this projection equipment in a somewhat small space. All of the projectors at this time utilized carbon-arc lamps as their light sources. Carbon arc lamps had been in wide use since the s, and were used in motion picture projection into the s.

Brilliant light is produced when two carbon-rod electrodes are touched together and ignite, creating what is called an arc discharge — an arc of light jumping between the two electrodes. The carbon rods burn away during this process, so in every lamphouse the carbon holders are controlled by worm gears in an attempt to keep the carbons at the correct distance from each other as they burn up.

The carbon arc lamps produced a great deal of heat, as well as smoke from the burning carbons, and so the lamphouses were insulated so that the operators would not burn themselves, and they were always equipped with exhaust chimneys with fans to carry away the heat and carbon smoke.

Auditorium, ; photo collage showing 18' x 24' screen. Title card for King of Kingsdirected by Cecil B. Movies at this time were shipped to theatres on 1, foot reels of 35mm nitrate film. Often, two 1, foot reels were spliced together, making a 2, foot reel, which over time, became the industry standard.

A 2, foot reel is slightly more than 20 minutes worth of footage, and thus a 90 minute feature would be on 5 reels. One would run the first reel, and then "change-over" to the next projector, which would run the second reel and so on to the end.

The Chinese had three projectors installed, with the theory being that if one projector broke down for whatever reason, the show could still go on, as two functioning projectors remained. Making change-overs was a complex process, as both projectors had to have their arc lamps lit, and one projector's "douser" had to close at the end of one reel, while the "douser" on the next projector would open at the beginning of the next one; all the film had to be in the correct position for all of this to happen, complicated by the fact that the projectors started slowly and took time to get up to speed and so on.

Grauman's grupobittia.com / Projection and Sound Systems at Grauman's Chinese Theatre / Part 1

Naturally, a change-over could not be done by one person by hand without it looking funky, so several companies began to make "automatic dousers" which controlled the set of projector dousers electronically.

Only one douser could be open at one time. As a reel came to its end on machine 1, the operator would wait for a cue mark, seven seconds from the end of the reel. This was the cue to start the motor on machine 2.GIS Commons: An Introductory Textbook on Geographic Information Systems.

This is not a typical e-book; it is a free, web-based, open-source “textbook” available to anyone interested in using mapping tools to create maps.

Projection systems

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A map projection is a systematic transformation of the latitudes and longitudes of locations from the surface of a sphere or an ellipsoid into locations on a plane. such as those from national mapping systems, it is important to match the datum to the projection.

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Our media & control systems such as media servers, multi display and 3D mapping software as well as show control systems are used in a variety of applications.

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