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S. J. Begun (Clevite-Brush Development Co.) : Perhaps I missed one bit of data which would have been important, namely, what was the force acting against the head which gave you this particular wear? I don't think you mentioned it.
Mr. Ferber: I didn't mention it, I'm sorry; but the figure was on one of the graphs. It was 25 grams of force between the head and the film.
Mr. Begun: Did you record all the other geometric relationships? I would also be very interested in getting the specific pressures under which you operated in the beginning, and maybe after limited wear took place, and subsequently.
Mr. Ferber: The machine is so set up that the force is constant and the unit pressure between the head and the film would depend on how far down the head is worn, because the contact area changes as the head wears as shown in Fig. 3. We have made no tests with different forces due to its taking 777 hours just to make one test, but undoubtedly work will be done along such lines in the future.
J. Kenneth Lewis (U.S. Navy, Bureau of Ships): Did you observe any noticeable wear on the narrow guiderail used to guide the film at the picture gate due to the magnetic track, which you say is quite abrasive.
Mr. Ferber: No, we didn't show any signs of wear at the gate, and of course there is none on the sound drum since the
sound drum is narrower than the filr itself.
George Lewin (Signal Corps Photograph, Center) : I would like to make one othe comment which is directed to the mani facturers of the various striping methoc rather than to the present speaker. Ho\\ ever, wouldn't it be possible to add, whi} the stripe is being put on, some sort of transparent material alongside the ma§ netic stripe which would not affect th photographic sound track, but would poss bly equalize the wearing effect upon th head? Is that entirely ridiculous, or is possible?
Mr. Dimmick: It sounds like a very into esting suggestion.
Edward Schmidt (Reeves Soundcraft Corp. I don't suppose there's a direct answer t the question, except the fact that the CQ of striping right now is being objected to i some quarters, and certainly any addition; ; operation of the nature you propose woul ! add to the cost.
Ernest W. Franck (Reeves Soundcraft Corp.] I think it would clarify the thinking some; what if we think of the head wear as n<j being caused by the coating, but by tf dirt, the abrasive dust which is picked u]i The film base itself does considerable wea i ing for this reason — it picks up a lot <4 dust and dirt. Some types of coatings wii pick up more dust or dirt than others an^ hence wear the heads more, but it's tr] dirt, more than the film base and moi than the coatings, which does the damag
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April 1953 Journal of the SMPTE Vol.60