The spool fits into the player piano spool box whereupon the free end of the music sheet is hooked onto the take-up spool which will unwind the roll at an even pace across the reading mechanism ( the " tracker bar ") The music score to be played is programmed onto the paper by means of perforations.

The backing paper protects the film while it is wound on the spool, with enough extra length to allow loading and unloading the roll in daylight without exposing any of the film.

When the roll is fully exposed, the take up spool is removed for processing and the empty spool on which the film was originally wound is moved to the other side, becoming the take up spool for the next roll of film.

This is commonly achieved by dragging the string across the axle in such a way that the friction causes the spool to roll.

* By sandwiching a normal 35mm roll of film into the Holga's 120 spool, " sprocket hole " exposures may be taken that expose the entire surface of 135 film.

The film is also distinguished by how it is wound with regard to perforations and base or emulsion side, as well as whether it is packaged around a core, a daylight spool, or within a cartridge.

When the first pass is complete, the camera is opened and the spools are flipped and swapped ( the design of the spool hole ensures that this happens properly ) and the same film is then exposed along its other edge, the edge left unexposed on the first pass.

The endless loop tape concept continues to be used in modern movie projectors, although in that application the spool is actively rotated and not drawn by tension on the film.

This results in a longer film on the same spool, but there are no printed frame numbers.

The cartridge has a captive take-up spool, but no supply spool: the film and backing paper are simply coiled tightly and placed in the supply end of the cartridge.

As the film was rotated on a disc instead of over a spool, the cassette was very thin, as were most of the cameras.

This film strip is rolled up on a supply spool in the supply side chamber of a small twin chamber cartridge, with the film leader taped to a take-up spool in the take up chamber ; the film strips can be up to 50 frames in length for Riga Minox and Minox II, III, IIIs and B, from Minox BL and C onward, the Minox film cartridge holds, 15, 30, or 36 exposures.

This structure is often compared to thread wrapped around a spool.

Similarly, the amount of string wound around a spool is related to the spool's perimeter.

The fishing line is reeled in by a spool powered either by manual cranking or by an electric motor.

The centrepin reel is also historically and currently used for coarse fishing, it is undergoing a strong revival amongst contemporary coarse fish anglers, typically used in circumstances which don't demand long distance casting, a centrepin has the visceral advantage over a fixed spool reel in that it puts the angler in contact with the fish without the involvement of a slipping clutch.

A large diameter spool centerpin reel is attached in a low mount position on a 12 – 17 foot surfcasting pole by way of a bracket that allows the reel to be rotated 90 ° to the pole for casting and returned to a position to retrieve line.

In the casting position the spool is perpendicular to the pole, opening the face of the reel allowing the line to run off the side of the spool when released in the cast.

The surfcasting poles specifically designed for use with these reels have the reel low mounted as the line is held and released during the cast by the lower hand on the rod, unlike fixed spool or multiplier surf reels, and the lowest ring is of large diameter and around halfway along the poles length.

Bait casting reels are multiplying reels in which line is stored on a bearing-supported revolving spool.

This backlash is a result of the angular momentum of the spool and line which is not present with a fixed spool or spinning reel.

The thumb is used to halt the lure at the desired location and to prevent spool overrun.

This restraint is usually imposed by a finger or thumb placed in contact with the leading edge of the spool.

The name of Holden Illingworth, a textiles magnate, is associated with a class of reel with fixed spool that does not have different positions for casting and retrieval.

In casting, line is drawn off the leading edge of the spool-as with the turnabout-but is then restrained and rewound by a device which orbits around the stationary spool.

The eyes decrease in size from the handle to the tip, with the one nearest the handle usually much larger than the rest to allow less friction as the coiled line comes off the reel, and to gather the very large loops of line that come off the spinning reel's spool.

Rotating a handle on the side of the reel rotates the spool which retrieves the line, usually at a 1: 1 ratio ( i. e., one complete revolution of the handle equals one revolution of the spool ).

In order to fill up the reel spool and ensure an adequate reserve in case of a run by a powerful fish, fly lines are usually attached to a secondary line at the butt section, called backing.

In most compact cassettes the magnetic tape was attached to each spool with a leader, usually made of strong plastic ( see right-hand image ).

Film for home cinematography was usually supplied in rolls approximately 30 feet ( 9 m ) long and enclosed in a " charger " or magazine, but spool loading ( 50 ft / 15 m or 100 ft / 30 m ) was also available.

Engines in excavators drive hydraulic pumps ; there are usually 3 pumps: the two main pumps are for supplying oil at high pressure ( up to 5000 psi ) for the rams, swing motor, track motors, and accessories, and the third is a lower pressure ( 700 psi ) pump for Pilot Control, this circuit used for the control of the spool valves, this allows for a reduced effort required when operating the controls.

( On Unix-like systems, these areas are usually located in the < tt >/ var / spool </ tt > directory.

A surface marker buoy ( SMB ) tethered to a diver is usually towed on a thin line attached to a reel, spool or other device which allows the diver to control the line length, so that excessive slack line can be avoided.

They usually consist of a spool inside a cast iron or steel housing.

Bowfishing equipment usually adds a line attached to a spool or a reel as well as a specially designed, heavier arrow.

All of the articles in all of the newsgroups were stored in files on the local disk ( known as the " news spool "), and rn could simply read those files directly when presenting them to the user.

They typically include a level-wind mechanism to prevent the line from being trapped under itself on the spool during rewind and interfering with subsequent casts.

Spool tension on most modern bait casting reels can be adjusted with adjustable spool tension, a centrifugal brake, or a magnetic " cast control.

Bait casting reels are sometimes referred to as conventional reels in the U. S. They are known as multiplier reels in Europe, on account of their geared line retrieve ( one turn of the handle resulting in multiple turns of the spool ).

Though spinning reels do not suffer from backlash, the line can be trapped underneath itself on the spool or even detach from the reel in loose loops of line.

On the retrieve, the large rotating wire cage or bail ( either manually or trigger-operated ) serves as the line pickup, restoring the line to its original position on the spool.

However, the spin cast reel eliminates the large wire bail and line roller of the spinning reel in favor of one or two simple pickup pins and a metal cup to wind the line on the spool.

Pressing a button on the rear of the reel disengages the line pickup, and the button is then released during the forward cast to allow the line to fly off the spool.

* Webclamps clamp the webbing in the event of an accident and limit the distance the webbing can spool out ( caused by the unused webbing tightening on the central drum of the mechanism ).

The magnetic tape on VHS-C cassettes is wound on one main spool and uses a gear wheel to advance the tape.

Animation director Rich Moore modeled Barney's apartment on one he and several other animators who worked on the show shared, particularly the Farrah Fawcett poster and the cable spool table.

Among computer security specialists, it can refer to a denial-of-service attack performed by monopolizing limited resources that have no access controls ( for example, shared spool space on a multi-user system ).

In the simplest play, the string is intended to be wound on the spool by hand ; The yo-yo is thrown downwards, hits the end of the string, then winds up the string toward the hand, and finally the yo-yo is grabbed, ready to be thrown again.

These were driven by internal combustion engines, and controlled remotely from a shore station through several miles of wire wound on a spool on the boat.

Music rolls for pneumatic player pianos, often known as piano rolls, consist of a continuous sheet of paper rolled on to a spool.