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of all the lines T of the converging grills. Direct-vision zones G2, D2, Gl and Dl radiate on surface P. The convergent setting of the selector grills brought an important improvement in the projected stereoscopic vision of depth.2
The Findings of Russia's Ivanov
In 1945 and 1946, we had newspaper reports of excellent 35mm stereo motion pictures and free-vision theater projection in Moscow. Much of the information sounded far-fetched, especially concerning the technical means employed.
Since that date, a translation from the Russian reveals most of the steps used in their process: The screen employed was of lined network design converging, similar to the Noaillon theory shown in Fig. 2 and 3, but Ivanov's network is stationary. This
weblike network shown in Fig. 4 consists of more than 30,000 white enameled wires stretched from the top of the screen T to the meeting point on the bottom O. The shaded portion is the projected picture area. These wires pull a total tension of 30 tons. The total weight of the screen is approximately 6 tons. Figure 5 is a schematic of Russian origin showing the vertical screen format of the split frame. The stereo-screen image is estimated to be approximately 12 ft X 9 ft. Because of the very narrow and limited vision zones, the theater in which this screen is installed seats only 250 people.
According to Ivanov, the theory of Noaillon brought out the following defects: (1) considerable absorption of light and (2) a very narrow observation zone, which does not allow the spectator to move his head. These are
Jennings and Vanet: DirectVision Stereo Screen
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