- Sep 30, 2017 -
Normal Playing Cards are 54, Playing Cards positive is 54 different class capacity, the back of the 54 are the same, the back of the same reason is to play the role of fair entertainment, anti-fake. So when we print on the back of the printing of Playing Cards on the color requirements are very strict, we must ensure that each color is uniform, if there is a card back of the color is too deep or too shallow, some eyesight more powerful people can Look at the entertainment can remember this low card. Of course, can not be said to ensure that 100% each exactly the same, color: color, also known as color aberration, lens imaging is a serious flaw, occurs in the multi-color light as a light source, monochromatic light does not produce color. White light from the red orange, yellow, green, blue, purple seven kinds of different wavelengths of light, so when the lens through the refractive index is also different, so that a point in the image side may form a color spot. The main function of the optical system is achromatic.
Obviously, in order to let Playing Cards reach the farthest, each card should be in the most extreme position, and then stretched out a little will lose balance. If you record the length of a Playing Cards as one unit, the top card should extend 1/2 unit. The weight of the second card also acts on its own center, but at the same time it is also the right side of the pressure from the first card; by the principle of the lever, its balance should be in the center and the right Point, that is, the whole card four points. Therefore, the second card can extend the length of 1/4 unit. Likewise, the center of the third card has its own gravity, and the rightmost bear the weight of the two cards, so its balance is at the third part of the right half of the whole card, Out of the length of 1/6 units.
Corner code is the number of Playing Cards corner, such as A, K, 8, etc., perhaps most of the modern people think that there is Playing Cards appeared, it is understood that the early Playing Cards and no corner code, which The biggest problem with Playing Cards is that you must see the entire Playing Cards to see the size of the Playing Cards. Until 1870 years later, only by the Americans invented the corner code.
In the 18th century, Playing Cards had printed Roman alphabet or Arabic numerals on one of the top corners of Playing Cards for identification, but this method had been used only on color Playing Cards and Spanish Playing Cards. Used in the general French color Playing Cards, until the 19th century. According to historical records, in the 1870s, three US Playing Cards manufacturers, respectively, using a different approach to solve this problem. A manufacturer prints a thumbnail pattern on each of the two corners of each card, called a triple. This method is now less used. One of the two corners of each card is printed with a color symbol and a number or letter, called double angle code, which is the most popular method, the United Kingdom and the United States Playing Cards generally use this method. The last one in each card's four corners are printed on the color symbols and a number or letter, known as the four corners of the code, this method of printing Playing Cards regardless of the card to the left or right into a fan, you can see the angle On the corner code, now Europe's Playing Cards are usually printed in this form.
Playing cards in the J (JACK) originally used KNAVE (villain) word, the word until the 20th century, 40 years in the UK and the European continent is also quite popular, and now has been basically abandoned, but in Europe, such as Sweden and some other countries, In the use of the word. The use of JACK instead of KNAVE is one of the reasons why KNAVE can be quickly accepted by the public. It is convenient to use the JACK word when recording or reporting a license, or when using abbreviations, or when describing the playing process A letter J, and in the past with KNAVE the word, you must use Kn, if only K will cause confusion. Whether in the country or abroad, the most popular and popular factors are because of its convenient public.