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THE FILM 187
because the projectors are always in full sight bul a few
paces away.
Rewinder Details
An opening approximately 2.5 inches by 4.5 inches should be cut clear through the rewinder table top and covered, flush with the table top with a piece of thick ground glass. (53 J If no ready ground glass is available, an ordinary piece of glass may be ground down by rubbing it vigorously with No. 00 or 0 emery paper or cloth.
Under the glass install a low c. p. electric light globe operated by a switch conveniently located near by. It will aid in making good film splices. It is not essential equipment in connection with a rewinder but is sufficiently helpful to justify its addition.
(54) If the rewinder you use is not a single unit, that is, if both elements are not mounted on a single metal base, be sure that you set them up in perfect alignment so that the reels are in perfect alignment, too. This is an item that is neglected by many projectionists who should know better.
(55) If the rewinding speed is high, the reels imperfect or the rewinder elements out of line, the film will suffer heavily. When the reels are out of alignment the edge of the film will rub against the reel sides with sufficient force to tip one side of the film up until the sound band is abraded and permanently injured.
It is best to use a single unit rewinder to avoid all possibilities of poor alignment. If separate rewinder elements must be used at least make sure that each is securely fastened to the table top in absolute alignment with the other.
(56) The rewinder element, from which the film is being unwound must be equipped with a brake strong enough to make the film rewind snugly though not too tightly. No rule for the amount of braking power can be made ; the projectionist must determine that for himself. If the rewinder is an enclosed unit, a brake is always part of its equipment. If separate rewinder ele