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Today, nitrate film projection is rare and normally highly regulated and requires extensive precautions, including extra health-and-safety training for projectionists. Today, the Dryden Theatre at the George Eastman Museum is one of a few theaters in the world that is capable of safely projecting nitrate films and regularly screens them to the public. The manufacturing process was not properly understood and few safety measures were put in place. If you’re doing a bank shot, you need to not only hit the rail at the correct angle, but you need to put the correct amount of English on the ball so it goes where you want. Unlike most other flammable materials, nitrocellulose does not need a source of air to continue burning, since it contains sufficient oxygen within its molecular structure to sustain a flame. In 1855, the first human-made plastic, nitrocellulose (branded Parkesine, patented in 1862), was created by Alexander Parkes from cellulose treated with nitric acid and a solvent. Related fires in other medical facilities prompted the growing disuse of nitrocellulose stock for X-rays by 1933, nearly two decades before its use was discontinued for motion-picture films in favour of cellulose acetate film, more commonly known as "safety film".

Even on the occasions when nitrate stock did not start a devastating blaze, once flames from other sources spread to large nearby film collections, the resulting combustion greatly intensified the fires and substantially increased the scope of their damage. Cinema fires caused by the ignition of nitrocellulose film stock commonly occurred as well. Owing to public safety precautions, London Underground forbade transport of movies on its system until well past the introduction of safety film. A breaking foul is penalized by the loss of two points as mentioned under 4.3 Opening Break Shot, as well as a possible re-break. He gave exhibitions showing spin shots previously not possible. Studies have shown that these gentle colors - the classic pool table green and Tournament Blue shades specifically - are very easy on the human eye. For example, this hanging billiard light fixture is suited for 7 to 9-foot pool tables. Hanging your lights too low encourages damage because your patrons are more likely to hit them with their cue stick. The prototype game was played with two balls on a six-pocket table with a hoop similar to a croquet wicket and an upright stick used as a target. Each of the balls has a diameter of 2 1/16 inches.

In almost every version of 8-ball pool, scratching is considered a foul when shooting at object balls other than the 8 ball. A newer version of this source is available: 2021/2022 ed. Projection rooms may also be required to have automatic metal covers for the projection windows, preventing the spread of fire to the auditorium. A special projector certified to run nitrate films has many modifications, among them the chambering of the feed and takeup reels in thick metal covers with small slits to allow the film to run through them. Many films produced during the early 20th century were lost through this accelerating, self-catalyzed disintegration or through studio warehouse fires, and many others were deliberately destroyed specifically to avoid the fire risk. As a projectile driver, it had around six times the gas generation of an equal volume of black powder and produced less smoke and less heating. Nitrocellulose was found to gradually decompose, releasing nitric acid and further catalyzing the decomposition (eventually into a flammable powder). After two minutes, the cotton was removed and washed in cold water to set the esterification level and to remove all acid residue. A training film for projectionists included footage of a controlled ignition of a reel of nitrate film, which continued to burn even when fully submerged in water.

Acetate film manufactured during the era when nitrate films were still in use was marked "Safety" or "Safety Film" along one edge in dark letters. Nitrocellulose film base manufactured by Kodak can be identified by the presence of the word "nitrate" in dark letters along one edge; the word only in clear letters on a dark background indicates derivation from a nitrate base original negative or projection print, but the film in hand itself may be a later print or copy negative, made on safety film. The method was to immerse one part of fine cotton in 15 parts of an equal blend of sulfuric acid and nitric acid. Collisions can only be elastic if the masses are equal. What happens during inelastic collisions? Most collisions between billiard balls don’t happen in a straight line. Pool uses a rack that arranges the balls in a triangular shape when the game starts. The extinguishers automatically trigger if a piece of film near the gate starts to burn. The projector is additionally modified to accommodate several fire extinguishers with nozzles aimed at the film gate.

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