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March 3, 2011 02:01 pm PST
Original Link: http://feeds.boingboing.net/~r/boingboing/iBag/~3/6O0S7IcS7pM/early-multi-projecto.html
Early multi-projector was a series of tubes
Here's a clever way of projecting the same movie onto several screens throughout a building using tubes, mirrors and multiple apertures: It must be assumed that the average reader understands how a picture film passes through the projection machine. The "frames" --that is, each individual picture on the strip of film--are exposed momentarily before the aperture in the gate of the projection machine. A powerful light is focused upon the aperture, and projects the image on the film through a lens to the screen. Seemingly, pictures in motion result. Now, if a second aperture is cut in the gate, two frames can be exposed simultaneously. A special condenser lens floods both apertures with light. The light beam from the second aperture, carrying the picture image, is conveyed through a black-lined tube fitted with special mirrors and lenses, to a remote point where it is projected on the back of a ground glass plate. The visible result is similar to looking into the finder of a camera. Movie Shown on 2 Screens (Apr, 1931)...
Original Link: http://feeds.boingboing.net/~r/boingboing/iBag/~3/6O0S7IcS7pM/early-multi-projecto.html
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