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What is a Scratch in Pool?
Jame | 24-09-16 15:41 | 조회수 : 6
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Triacetate remains in use for most camera negative stocks because it can be "invisibly" spliced using solvents during negative assembly, while polyester film is usually spliced using adhesive tape patches, which leave visible marks in the frame area. However, ultrasonic splicing in the frame line area can be invisible. The way your lighting resonates with your players can affect whether people use your pool tables or leave them to gather dust. Some of the most popular styles for bars, breweries and game rooms these days are industrial, farmhouse and rustic lighting fixtures. If you’re struggling to figure out how to find the right lighting setup for your pool table, this post is for you. Also, you can find many multi-shade dining room or kitchen chandeliers that are designed to hang from the ceiling and that would work well over a pool table. For example, many table owners prefer using 60-watt compact florescent light (CFL) bulbs in their fixtures, while many newer fixtures are designed to work with LED bulbs.


The crucial advantage cellulose triacetate had over nitrate was that it was no more of a fire risk than paper (the stock is often referred to as "non-flam": this is true-but it is combustible, just not in as volatile or as dangerous a way as nitrate), while it almost matched the cost and durability of nitrate. Nitrate dominated the market for professional-use 35 mm motion picture film from the industry's origins to the early 1950s. While cellulose acetate-based safety film, notably cellulose diacetate and cellulose acetate propionate, was produced in the gauge for small-scale use in niche applications (such as printing advertisements and other short films to enable them to be sent through the mails without the need for fire safety precautions), the early generations of safety film base had two major disadvantages relative to nitrate: it was much more expensive to manufacture, and considerably less durable in repeated projection. For this reason, immersing burning film in water may not extinguish it, and could actually increase the amount of smoke produced. That tragedy claimed 123 lives during the fire and additional fatalities several days later, when hospitalized victims died due to inhaling excessive amounts of smoke from the burning film, which was laced with toxic gases such as sulfur dioxide and hydrogen cyanide.


Although triacetate does not decompose in as dangerous a way as nitrate does, it is still subject to a process known as deacetylation, often nicknamed "vinegar syndrome" (due to the acetic acid smell of decomposing film) by archivists, which causes the film to shrink, deform, become brittle and eventually unusable. Nitrocellulose was found to gradually decompose, releasing nitric acid and further catalyzing the decomposition (eventually into a flammable powder). 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. Once burning, it is extremely difficult to extinguish. It remains open until one player legally pockets any called ball other than the 8 after the break. 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. Owing to public safety precautions, London Underground forbade transport of movies on its system until well past the introduction of safety film. 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".

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PET, like cellulose mononitrate, is less prone to stretching than other available plastics. The principle here is much the same, with the railguns behaving somewhat like discretized versions of thrusters, providing instantaneous changes in velocity as opposed to sustained steady change. The game arose from two changes made, namely that the 8 ball must be pocketed last to win, and that each player may pocket only half of the other object balls. 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. 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. Today, nitrate film projection is rare and normally highly regulated and requires extensive precautions, including extra health-and-safety training for projectionists. 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.



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