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Penneahle Projection Screens — Raven 469
The picture surface of this screen has a slightly corrugated effect, but this is not at all discernable at distances from which pictures would ordinarily be viewed by an audience. From such a distance it appears to be a regular opaque screen without perforations or openings of any kind, and the reflected picture has no suggestion of haze, smudge or halation and is perfect in depth and detail.
DISCUSSION
Mr. Ross: I suggest that the speaker use some chalk and the board to give an idea of the louvers.
Mr. Ea^ten : There arc so many things involved, and the structure of the screen is so intricate that I doubt being able to sketch it. (Drawing)
The veins lie somewhat in this manner, and it is possible to get from 45 to 80 per cent of open space, depending upon how close the veins are placed and the angle of their inclination.
These limits are governed mainly by the theatre in which the screen is to be installed. On a large screen, such as would be installed in a theatre like ' ' Roxy 's, " it is possible to have considerable separation between the veins before the roughness, due to the separation, becomes noticeable to the audience, because even the people in the front rows sit at a considerable distance from the screen; but in the smaller theatres, where the audience is' rather close to the screen it is necessary to reduce the separation, which, of course, cuts down the amount of open sound space. Fortunately, the smaller theatres do not require the same volume of sound as the larger ones, and advantage can be taken of this, and screens built suitable for any theatre.
The viewing angle of that part of the audience seated here (indicating the main floor of auditorium) is such that it is impossible to see through these openings. The people who are elevated sufficiently to be able to see through are in the rear of the balcony and generally so far away from the screen that detail is beyond their perception, and the possibility of their being able to detect the openings is remote.