How to add sound to amateur films (1954)

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example, might be recorded on one system and dialogue on another. Spooling The magnetic stripe is very thin — about one-tenth of the film thickness. When the film is spooled, however, the presence of a stripe on only one edge encourages buckling and irregular spooling. It is general practice, therefore, to apply a balancing stripe along the opposite edge of the film. The film then spools in a normal manner. Because its overall thickness is increased by one-tenth, however, you can get rather less film on a reel after striping. A 400-foot reel will hold only 360 feet, and so on. So don't fill a reel too exactly before despatching for striping. Cleanliness No careful projectionist allows oil, grease or dirt to get on his films. But he may have wax applied to protect both film and projector against corning up. The very thin layer of wax over the margins of the film guards against the loss of particles of emulsion in the gate channels. It is these particles of emulsion which sometimes scratch the film and build up, snowball fashion, into a surprisingly hard corn. A magnetic coating cannot be applied to the film while there is wax, oil or grease on the surface. So if your film is not perfectly clean, have it cleaned before striping. If you hope to avoid this necessity, wear thin cotton gloves to handle the film during editing. Bare fingers inevitably leave greasy marks and these are doubly objectionable on film for striping. When you use a magnetic stripe projector, be particularly careful to keep everything clean. The magnetic oxide used for the stripe is highly abrasive. So if any rubs off the film during projection, see it does not get into the projector mechanism. 105