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THE FILM 193
(64) The exchanges, however, still consider the 1,000-foot reel more desirable. They fear the weight of the added film on the larger reel will make damages more likely during transit. Increased weight calls for heavier shipping cans, an investment they would rather not make. They claim also, and rightly, that as weight of more film is added to rolls of old dry film, the film will be injured during projection. And there are further objections.
(65) Projectionists, on the other hand, hold that projection today is complicated and difficult and should be made as easy as possible whenever the opportunity affords itself. This is particularly true in theatres where only one projectionist is on duty at a time. At every change-over he is away from the working projector, threading the idle one, adjusting its carbons and making other preparations — a dangerous situation which the 2,000-foot reel reduces by half.
How to Estimate Footage in a Film Roll
(66) How may the footage in a roll of film be estimated?
Because film varies between 5^/1000 and 6/1000 of an inch in thickness and because the tightness of the winding varies in different rolls of film, it is possible to calculate the footage contained in any roll with only approximate accuracy. However, it may be estimated as follows, using inches for all measurements: (67) First add the circumference of the opening (reel Hub) in the center to the outer circumference of the film roll. Divide by 2. This will give the average length, in inches, of layers of film in the roll. Next, measure from outer to inner diameter of the film roll and divide by S^i (a compromise between the film thickness of Sy2 /WOO and 6/1000 of an inch). Result will be the approximate number of layers of film in the roll. Multiply this by the average length of the layers and divide by 12 to get the number of feet. Final results will be footage of film in the roll as nearly as it can be arrived at by computation.