A reel is a tool used to store elongated and flexible objects (e.g. /rope, , electric cable, , etc.) by wrapping the material around a cylindrical core known as a bobbin. Many reels also have (known as the rims) around the ends of the spool to help retain the wrapped material and prevent unwanted slippage off the ends. In most cases, the reel spool is hollow in order to pass an axle and allow it to spin like a wheel, a winding process known as reeling, which can be done by manually turning the reel with or cranks, or by machine-powered rotating via (typically electric motor) .
Other issues affecting the core size include:
With material such as photographic film that is flat and long but is relatively wide, the material generally is stored in successive single layers. In cases where the material is more uniform in cross-section (for example, a cable), the material may be safely wound around a reel that is wider than its width. In this case, several windings are needed to create a layer on the reel.
A so-called "two-reeler" would have run about 15–24 minutes since the actual short film shipped to a movie theater for exhibition may have had slightly less (but rarely more) than on it. Most modern projectionists use the term "reel" when referring to a "two-reeler", as modern films are rarely shipped by single reels. A standard Hollywood movie averages about five 2,000-foot reels in length.
The "reel" was established as a standard measurement because of considerations in printing motion picture film at a film laboratory, for shipping (especially the film case sizes) and for the size of the physical film magazine attached to the motion picture projector. If it had not been standardized (at of 35 mm film), there would have been many difficulties in the manufacture of the related equipment. A 16 mm "reel" is . It runs, at sound speed, approximately the same amount of time (11–12 minutes) as a 35 mm reel.
A "split reel" is a motion picture film reel in two halves that, when assembled, hold a specific length of motion picture film that has been wound on a plastic core. Using a split reel allows film to be shipped or handled in a lighter and smaller form than film would on a "fixed" reel. In the Silent film, the term was used to describe a single reel that accommodated two or more individual titles.
As digital cinema catches on, the physical reel is being replaced by a virtual format called Digital Cinema Package, which can be distributed using any storage medium (such as hard drives) or data transfer medium (such as the internet or satellite links) and projected using a digital projector instead of a Movie projector.
A newsreel is a short documentary film.
A showreel or demo reel is a short film showcasing a person's or organization's previous work.
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