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fore we try to get the tape in intimate contact with the heads to see just what is a factor in the tape itself exclusive of the tape drive.
Mr. Lewin: That is particularly interesting then, because I think this is the first time we have any actual proof that possibly the tape itself is very uniform, and that a lot of our present troubles originate in our reproducers.
Mr. Horak: Some of the commercial tape is very good that way, particularly the £-in. tape on thin base stock. Our own material averages 6%, with perhaps instantaneous peaks up to 10 or 20%.
Mr. Lewin: It certainly does point up the fact that most of the trouble we're having is due to poor contact in the commercialtype reproducers.
Mr. Horak: Yes. Also I'm very careful at all times, whenever I make a new test on a narrower or wider track or on a different type of tape, to lap the heads for each tape.
B. L. Kaspin (Bell & Howe/I): In your coating mechanism, do you have any sort of control device to keep the magnetic material in the reservoir into which the beading wheel dips at a constant level?
Mr. Dedell: No, it is filled by hand.
Mr. Kaspin: The thickness of the coating doesn't vary, then, as the material in the reservoir goes down?
Mr. Dedell: Not for a difference of a half an inch in level.
Charles O. Probst (Goodyear Aircraft Corp. Akron, Ohio) : Did I understand you t emphasize that you had only worked wit] processed stock?
Mr. Dedell: That's right.
Mr. Probst: Do you have reason to be lieve that you will be in any trouble wit)' Kodachrome, coating it before exposur Or processing?
Mr. Dedell: Yes; you cannot coat, witi this formula anyway, on either the has side or the emulsion side of ra\\-stoc Kodachrome. The track will come off L the processing.
Donald Bleier (Signal Corps Engineerin Laboratories) : With respect to the dryin portion of the machine, could you give little more detail as to whether or not yo use lamps, or just air, and how long is th film exposed to the drier?
Mr. Dedell: I mentioned that the film i dried for 2.8 minutes when we're runnin at 20 feet per minute. The drying ai' blows through cross-strip heaters.
R. Paul Ireland (EDL Company): Ho\' closely are you able to control the widt of the coating? Having the coating rolle • only about two-thirds the width of thj expected track, one might expect somi difficulty in controlling the track width, j
Mr. Dedell: Measurements we have mad on the track along its length show that w usually control the width within plus o minus 1 mil. The specifications call fo plus or minus 2 mils.
500
April 1953 Journal of the SMPTE Vol.60