You may not know there are some other interesting use for these small compasses. Lets see some you photos and you get clear.

China is the universally accepted country who invented the compass. The invention of the compass of our working people in long-term practice of understanding the results of magnetic objects. As the production of labor, people contact the magnetite, and began to understand the nature of the magnetic. People first discovered the nature of the magnet to attract iron, and later discovered the point of the magnet. After many experiments and research, and finally invented a practical compass. The first magnet compass is made of natural, which shows that the Han Chinese working people have long found a natural magnet and the absorption of iron. According to ancient records, far away in the Spring and Autumn Period, as is in the slave society to feudal society, the transition period of great change, productivity has been greatly developed, especially the rise of agricultural production is developed, which has prompted the mining, smelting development of the industry. Production in long-term practice, people know the magnet from the iron ore.

7th century BC, a book of the "tube to a few" on the record: "There is a magnet who, under the copper-gold." Meaning that if the mountain there is a magnet, the mountains on the possession of iron ore. Geographic classic "Shan Hai Jing", also recorded "more than a magnet problem filling the mountains." "Waterways" in the state of Qin Metrical recorded in front of the door with a magnet made of anti-avoidance was the palace Mouci assassination, such as Phi bad dark armor, weapons hidden palace, the door will be sucked and was found, This shows that people have long found that the absorption of iron of the magnet, and make use of.

Production in long-term struggle, our working people the means to further the use of magnet polarity, the direction of the machine made, this is the compass. This is "a degree of Han Feizi articles" and in "An Exposition", a book has a record. In "An Exposition" in the records, said Zheng into the mountain forests to collect jade in time, in order not to lose direction, with "Ian." This "Ian" is the compass of this machinery. Han Wang in "On balance" described in the "Ian", it is only water as a spoon,

Polished surface with a natural magnet into, spoon at the end of the spherical body, oval-shaped spoon, spoon handle whole body gradually shrunk to columnar. In order to determine the direction, comes with a "site", it is copper or painted wood plate, the central groove is smooth and round, inside round shape may be foreign, box depicts the orientation of the scale, with "dry" "branch" (ie A, B, C, D ... and the child, the ugly, Yin, Mao ...) as well as gossip, suggests that twenty-four position. Will vote at the central site, its shank will generally stop position on guide. Above we can see that Ian is a modern compass (magnetic compass) of the body. "Guide" is Zhang Heng in the "Tokyo Fu," first put forward in the future through the Wei, Jin and Southern and Northern Dynasties, Sui, Tang, Song after a thousand years until gradually developing. Distinguished scientist Shen Kuo in the Song Dynasty, "Meng Xi Bi Tan", the current status of development of the compass, made a detailed exposition. At that time in the production and promotion of the development of scientific experiments, especially the maritime industry and the rise of foreign trade expansion, the compass gradually developed. Shen Kuo summarizes the practice in the creation of working people in the four compass device method. The first is the water float, float on the water for the needle guide, although relatively stable, but is easy to volatility; The second is the spin titration nail, the nail will be placed on the needle, rotating flexible and easy to fall; third rotating bowl lip is fixed, the edge of the needle place-sized, rotating more flexible, but easy to fall; The fourth method is to spin thread, needle with silk to hang up, flexible and stable rotation can be achieved. He also recorded the method of artificial magnetic granted that the "magnet grinding front, you can guide." This is made with artificial magnets, is a huge step forward. In addition, the system had also been out "guide to fish", "dry needle", "water needle." Dry needles, water, two compass needles, a modern compass (compass) of the basic structural principle of the foundation. Shen Kuo compass in the study process, summarize, and also have found magnetic declination exist. In other words, the compass indicates the direction, "Ordinary Differential east, the south is also incomplete." This is our country made great contributions to geomagnetism.

Nowadays, the technology is developing fast and improved a lot. We have manufactured modern compasses to help and to bring fun to people's outdoor life. If you need to purchase compasses, do not forget to buy from China at very good price.

Shenzhen(IPA: [ʂə́ntʂə̂n]) is a major city in the south of Southern China's Guangdong Province, situated immediately north of Hong Kong. The area became China's first—and one of the most successful—Special Economic Zones (SEZs). It currently also holds sub-provincial administrative status, with powers slightly less than a province.

Shenzhen's novel and modern cityscape is the result of the vibrant economy made possible by rapid foreign investment since the institution of the policy of "reform and opening" establishment of the SEZ in the late 1970s. Before this, Shenzhen was a small village. Both Chinese and foreign nationals have invested enormous sums in the Shenzhen SEZ. More than US$30 billion in foreign investment has gone into both foreign-owned and joint ventures, at first mainly in manufacturing but more recently in the service industries as well. Shenzhen is now reputedly one of the fastest-growing cities in the world.^[2]

Being southern mainland China's major financial centre, Shenzhen is home to the Shenzhen Stock Exchange as well as the headquarters of numerous high-tech companies. Shenzhen is also the third-busiest container port in China, after Shanghai and Hong Kong.

Lear more at

http://www.china-map-guide.com/

http://www.sznews.com/2009/sz/shenzhen.htm

1. The compass should be used in horizontal position. It can not correctly point the direction in vertical or oblique position.
2. Keep it away from the magnetic place, metal objects such as cars, cameras, loudspeakers and other metal objects. These may effect the compass function or even change its magentic pole.
3. Use it under -10~60℃ environmental temperature. Otherwise, the compass may not work correctly or even broken.

Why a compass might not point north if placed near a wire with a current?
A magnetic field exists in the space surrounding a current-carrying conductor.

At the point in space where the compass sits, if the strength of the fields due to electrical conductors in the vicinity is a significant fraction of the strength of the earth's magnetic field, then the compass reading is guaranteed inaccurate.

SHENZHEN - The Universiade has enhanced economic openness and accelerated communication with the world, the Shenzhen Social Science Academy's Vice-President, Huang Fayu, said on Saturday, Aug 20.

"The Universiade has had a major impact on the city in many respects," Huang said.

"It gave Shenzhen a precious opportunity to better introduce itself to the world. It also provided citizens a chance to broaden their horizons and learn more about the different cultures of different countries.

It has also brought about substantial improvements in infrastructure, civility, livelihoods and the like."

Shenzhen began its transformation as a key experimental economic zone 30 years ago when it was a small fishing settlement.

Its economic openness has propelled its advance as a metropolis and economic leader.

Huang believed such international events as the Universiade could improve Shenzhen's investment environment.

In 2009, the Comprehensive Economy Openness Index, which evaluates economic performance in such major areas as trade, investment and industrial output, found Shenzhen to be the mainland's most economically open city.

Shenzhen's index rating was 60.33 percent - 41.36 percentage points higher than the average mainland city. Beijing was rated at 37.12 percent, while Shanghai was 42.36 percent.

Shenzhen's total foreign trade value reached $346.7 billion in 2010. Its export value was $204 billion, or 12.9 percent of the country's total. The city has had the highest export value among all Chinese cities for 18 years.

Shenzhen also possesses diverse economic ownership, with most of the economy in private hands. As of 2009, there were 6.3 million employees, 93.35 percent of whom worked for non-State-owned enterprises.

Shenzhen is a city of immigrants. There were only 300,000 people in Shenzhen 30 years ago. As of November 2011, immigrant influx increased the population to 10.3 million. Almost everyone is covered by the social medical security system, although less than 25 percent of residents have residency permits.

Shenzhen is also a tourism destination. In 2010, the city hosted about 77 million tourists and the tourism industry generated 62.8 billion yuan.

You can visit offcial site at http://www.sz2011.org