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252 H. J. HASBROUCK
DISCUSSION
MR. WOLF : Is this a conventional form of acetate ?
MR. HASBROUCK: Yes. The response was equalized to 9500 or 10,000 cps. There was no limitation below that either in recording or reproduction.
MR. WOLF: Are any of the studios now making use of it for playback?
MR. HASBROUCK: Yes, many of them, both motion picture and broadcast studios.
MR. CARVER: When you say the "conventional type acetate" I suppose you mean nitrate. All I have ever seen was nitrate.
MR. HASBROUCK: That word "acetate" is misused. It is a nitrate base. There are other ingredients.
MR. CRABTREE : What are the merits of this lateral system as against the hilland-dale?
MR. HASBROUCK: That has been discussed at great length in many publications. The chief advantage is the cancellation of even-harmonic distortion in the lateral system. It is similar to a "push-pull" amplifier.
MR. JOHNSON: The hill-and-dale controversy is like an automobile running over a rough road, compared to an engine on a wavy track. The best contact between the needle and the groove will, of course, be in the lateral cut track. When the stylus digs deeper the drag is greater, and there is likely to be chattering.
MR. CRABTREE : Many years ago we had demonstrations at these meetings of hill-and-dale records which, to me, were quite pleasing. It is unfortunate that the author did not bring along his recorder and actually record in the room and reproduce, say, a speech by our President. I wish we could arrange at the next meeting for someone to put on such a demonstration. It means so much more when we hear the original and then the reproduction, than to hear merely the reproduction.
MR. WOLF: Is this system used in Hollywood to the exclusion of other playback methods? Is the Miller system being used at all for immediate playback:
MR. WOLFE : To the best of my knowledge, the Miller system is not being used in the studios, but this method is certainly not the only one in use for playback purposes.
Again, so far as I know, variable-density negative is not being played back in the studios, but R.K.O. does play back variable-area negative in certain cases. Two methods of playing back are used : either acetate disk, some of it lateral and some hill-and-dale, or by reproduction from film.
MR. WOLF: I think before long electromagnetic recording will probably be in the studios. The Bell Laboratory has been working for a number of years on that method of recording. I think you will see at the New York World's Fair, if not before, a quality of magnetic recording comparable with the best playbacks most of us have ever heard. That medium will also be very useful for certain kinds of playback and editing.