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Recording with the Light Valve — MacKenzie 743
Mr. Ross: What is the object of connecting two recording outfits to the system?
Dr. MacKenzie: So that you can be sure of recording in case one gives out.
Mr. Palmer: What does the grain size of the emulsion have to do with the problem of recording? Also, if I understand correctly, the loud speaker is actuated by light passing through the film, and this hits the cell while the picture is being made. Does light reaching the cell have to pass through the film first?
Dr. MacKenzie: Yes.
Mr. Palmer : It seems to me the film would distort the current so that you would not get a correct reproduction of the sound.
Dr. MacKenzie: It would distort focus, but the cell does not care about this. The light through the film is modulated. A film is uniform when exposed because the photo-chemical effect doesn't show up until the film is immersed in the developer. It can't guarantee that the light is properly focused.
Mr. Palmer: There might be one stage in the cycle where the light energy was not sufficient to pass through the film.
Dr. MacKenzie: It doesn't happen that way. What the cell cares about is not so much the amount of light as the variation in it. The amount of current in the cell depends on the maximum and the minimum. If you get 4% on one side and zero on the other, it is proportional to 4. This effect you mention is where some light gets through. Do you know whether there is a minimum amount of light the cell cares about, Mr. Koller?
Mr. Koller: It is very little.
Mr. Palmer: What effect does the grain size have?
Dr. MacKenzie : It doesn't have any, because it is finer than the resolving power of the film. Resolving power matters most. As Dr. Mees said yesterday, the film grain is about a thousandth of a millimeter, and the element of track we are interested in covers many thousands.
Mr. Mole: In the construction of the sound stages in the Hollywood studios, some installations are putting in wax recording as well as film. The wax is for the purpose of the "play back." Has anything been done on film recording for the same purpose?
Dr. MacKenzie: No play-back is possible until the film is developed. As the record is made, you listen by means of the photo