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641 HANDBOOK OF PROJECTION FOR
Theatre managers will do well to understand the simple fact that all unnecessary damage done to films while in their own or any other theatre, becomes, of necessity, part of the overhead expense in film distribution. If, through carelessness in handling films on bad reels, etc., a heavy decrease in the life of the film is caused, then whatever the damage is, it must, and inevitably will be added to the film rentals. We venture the assertion that if theatre managers used a little common sense, and insisted that the films be handled carefully, and on reels that are in good condition, and that rewinding be done at the rate of six or seven minutes to the reel, instead of one or two minutes, film rentals would within a short time be reduced in a very noticeable amount.
GENERAL INSTRUCTION NO. 16— UPPER MAGAZINE TENSION. — In professional projectors there is usually some sort of tension device in the upper magazine, the purpose of which is to prevent the reel from revolving too freely. It is important that this device be so designed that it will not catch on loose screws or reel hubs, and that the tension be of sufficient amount to just barely keep the film taut at all times, and stop the reel instantly when the projector stops. The importance of this latter will be realized when we consider that if the reel revolves too freely, and the projector be stopped when the upper reel is three-quarters or more emptied, and the reel continues to make one or two revolutions after the projector has stopped, thus unwinding considerable slack film, when the projector is started it is likely to come up to normal speed before it takes up all the slack film, whereupon the upper reel will be subjected to a sharp jerk, which may pull a splice in two, rip out sprocket holes and lose the upper loop, or even pull the film itself in two.
GENERAL INSTRUCTION NO. 17— FILING THE APERTURE.— It is sometimes necessary that the form of the projector aperture be changed, in order to parallel the sides of the screen image when there is a pitch in the projection. You will find directions for doing this on Page 257.
GENERAL INSTRUCTION NO. 18.— The Standard aperture now in use and approved by the Society of Motion Picture Engineers, is .6795 (87/128) of an inch high by .9062 (29/32) of an inch wide.
GENERAL INSTRUCTION NO. 19 — MAGNETIZED SCREW DRIVER.— The projectionist will find a strongly magnetized screw driver a great convenience, particularly