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702 C. G. WEBER AND J. R. HILL
I advocated rear shutters long ago, before sound came into the pictures, and asked the manufacturers to design them. But no rear shutter will put elasticity back into a film that has had its edges dried by being stored in a dry atmosphere.
MR. WOLF: Perhaps Mr. Griffin could tell us what is the difference of temperature of the aperture with and without the shutter.
MR. GRIFFIN : In modern rear shutter design the temperature in some instances may be reduced by approximately two-thirds.
MR. WOLF : I was asked this summer at the International Standards Conference whether film was being made containing certain percentages of nitrate and acetate combined. I had thought that film was exclusively nitrate or exclusively acetate. Is such film being made?
MR. CARVER: Yes. Some film is made of nitro-acetate and some of mixed nitrate and acetate. I believe in France and in Germany some film is being made of nitro-acetate.
MR. WOLF: No motion picture film in this country is made of nitrate and acetate combined?
MR. CARVER: X-ray film has a small percentage of nitrate in some of the under layers.
MR. WOLF: The standard 16-mm. film in Germany has, I understand, some nitrate in it. I do not know what the percentage is.
MR. CRABTREE: Mr. Weber, suppose we condition a piece of film at a relative humidity of, say, 10 per cent, and wind it into a tight roll; how long will it take at a humidity of 70 per cent for the entire roll to reach equilibrium?
MR. WEBER: We have checked up on 35-mm. film that has been in the humidity room for more than a month, and it was definitely not in equilibrium. With the 16-mm. acetate film I do not imagine there would be much difficulty. As to the 35-mm. film in tight rolls, I doubt whether it would become conditioned in six months.
We have that same problem in connection with paper. Paper in a large, tight roll will not become conditioned within a year farther than about an inch from the ends of the roll. Besides, the paper has a much lower finish than the film so that the air would have better access than in the case of film. My guess is that it would be very doubtful whether a 35-mm. film would become conditioned in a six month's period in tight rolls.
MR. CRABTREE : Speaking of film containers, we must consider what may happen in very damp tropical climates. It is very difficult to maintain low relative humidities, and I do not think it would be safe to recommend cardboard containers. I think that metal containers should be insisted upon.
MR. WEBER: I would not recommend cardboard containers for acetate film unless there were a vault under some sort of control. Unless there is some way of drying the air it certainly would be extremely dangerous to store the films under such conditions.