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506
O. K. KOLB
November
When it is only a question of joining a number of scenes and editing the different takes, the quickest method has been found to be to join the individual lengths of film together in the usual way and to punch a hole (either round or preferably diamond-shaped) through the position of the joint on the sound track as shown in Fig. 8-A. The cutting, splicing and punching tools for carrying out this operation should be nonmagnetic and preferably made of nonferrous material; in this respect tools made of beryllium copper have so far proved to be the most satisfactory.
However, should the cutting and punching be done with steel tools it has been found that demagnetization of the joint with an erasing tool helps to make it silent.
This erasing tool or, as it is better known, "magnetic brush," consists of an iron bar surrounded by a coil which is connected to the ordinary mains current supply. The tool which, in effect, constitutes a low-frequency magnetic field, is provided with a handle and this gives it the appearance and ease of handling of a soldering iron.
This instrument has proved very satisfactory in all cases where small amounts of remanent magnetism have had to be removed from
Fig. 8. Magnetic sound film joints (A, for joining separate takes; and B, for joining lengths of stock wiped for re-use).
film joints or other small articles by simply touching or gently brushing it over the item to be demagnetized.
The second method of eliminating remanent magnetism from film joints has been found to be of most value in cases where lengths of wiped stock (film stock from which a previous recording has been erased) are joined together and again made available for recording. In this case it has been found best to remove all existing joints, including those punched through in the manner described above, and to make fresh oblique joints of the kind shown in Fig. 8-B. This type of joint has proved to be very satisfactory in practice as well as being silent and it is even possible to record sound signals over such a joint, after demagnetization, without any noticeable effect when the sound is reproduced.