Product Model: copper cap oil filling compass

500 pieces per bag, 10,000 pieces per piece

compass, also known as Compass, is a tool used to indicate direction, which is widely used in various direction interpretation, such as navigation, field exploration, City Road map reading and other fields. Compass is divided into two types: relying on magnetic force and not relying on magnetic force. The first one can be divided into two categories: the first one is the geomagnetic compass made according to the heteropolarity of the Earth's magnetic field, but the north-south direction indicated by this compass is different from the real north-south direction, and there is a magnetic declination angle; the second is electronic compass, which adopts magnetic resistance (MR) technology of magnetic field sensor, can well correct the problem of magnetic declination, and has been widely used in GPS positioning devices. As for those who do not rely on magnetic force, it is purely based on the physical methods inside the device to indicate the direction, such as car or inertial navigation system. Joseph Needham, a British Sinologist, called the Compass One of the "the four ancient Chinese inventions. Compass is called Compass in some places such as Taiwan, because contemporary pointing needles are often painted with coloring available marks at one end pointing to the north, which is convenient for users to find the North.

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