If there is no available spot, it is placed as close to its own spot as possible in a direct line between that spot and the top (black end) cushion, without touching another ball. A semicircle of radius 11.5 inches, called the “D”, is drawn behind this line, centred on the middle of the line. The cue ball is placed anywhere the breaker desires behind the head string. In both one-pocket and bank pool all fifteen object balls are racked entirely at random, with the center of the apex ball placed directly over the foot spot. At that time, the fourteen pocketed balls are racked with no apex ball, and the rack is so placed so that if the apex ball were in the rack, its center would rest directly over the table’s foot spot. Straight pool is played to a specific number of points agreed on prior to the match’s start, with each pocketed ball being worth one point to the shooter. Traditionally, the 1 ball is placed on the rack’s right corner, and the 5 ball on the left corner from the racker’s vantage point to maximize contrast between the corner balls and the background, as the 1 and 5 are the brightest colored balls, however, the world standardized rules do not require this.
However, all balls other than the 1 and 9 may be randomly placed. However, it’s still best to stay away from very bright or very dark colors, as these can still strain the eyes or reduce visibility. The glucose repeat unit (anhydroglucose) within the cellulose chain has three OH groups, each of which can form a nitrate ester. The quality of the cellulose is important. Nitrocellulose (also known as cellulose nitrate, flash paper, flash cotton, guncotton, pyroxylin and flash string, depending on form) is a highly flammable compound formed by nitrating cellulose through exposure to a mixture of nitric acid and sulfuric acid. The rules also vary depending on whether the cue ball or fifteenth ball are resting on the table’s head spot. After the first goal scored is determined who are the balls will clog in the future (depending on what you forgot striped or solid first). In nine-ball games where a handicap is given by one player being spotted a ball, some tournament venues enforce a rule that the spotted ball must be racked as one of the two balls in the row directly behind the 1 ball. Such rules are detailed on the following chart (note therein that the kitchen refers to the area behind the table’s head string).
Further up the table is the pink ball, which sits midway between the blue spot and the top cushion, followed by the red balls (one each), placed in a tightly-packed triangle behind the pink. He then alternately pockets red and coloured balls. Some players (most often amateurs) place the balls in numeric order but for the 9 ball; from the top of the triangle down and from left to right, i.e., the 1 on the foot spot, followed by the 2 then 3 in the second row, what is billiards and so on. After the initial rack, the balls are played until only the cue ball and one object ball remain on the table’s surface. The object of the game is to reach a certain number of points, typically seven, earned by being the first to run a hoop. You can also reach up and touch the underside of the playing surface to be sure. If you live in a temperate climate, you can rest easy knowing that your garage will be relatively safe for a pool table. Finally, the black ball is placed on a spot 12.75 inches from the top cushion on a full-size table.
At one end of the table (the “baulk end” ) is the so-called baulk line, which is 29 inches from the baulk end cushion. The balls used are smaller and the table is pocketed. The billiard balls, formerly made of ivory or Belgian clay, are now usually plastic; they each measure from about 21/4 to 23/8 inches (5.7 to 6 cm) in diameter, the larger balls being used in carom billiards. Table tennis balls, guitar picks, and some photographic films have fairly low esterification levels and burn comparatively slowly with some charred residue. A number of rules have developed which detail what must be done when one or both of the cue ball and fifteenth object ball are either in the rack area at the time an intragame rack is necessary, or are in such close proximity to the intragame racking area, that the physical rack cannot be used without moving the one or the other. Nitrocellulose lacquers have been used as a finish on furniture and musical instruments. Most lacquers are prepared from the dinitrate, whereas explosives are mainly the trinitrate. The principal uses of cellulose nitrate is for the production of lacquers and coatings, explosives, and celluloid.