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[* black] Before we get into the nitty gritty of things, let's understand what a gyroscope actually does.
[* black] According to [link|http://en.wikipedia.org/wiki/Gyroscope|Wikipedia's definition], "A gyroscope is a device for measuring or maintaining orientation, based on the principles of conservation of angular momentum." The key phrase is ''measuring or maintaining orientation'', which is the exact purpose why an iPhone 4 contains one of these gizmos.
[* black] A mechanical gyroscope - like the one shown on the left - uses a spinning rotor in the center to detect changes in orientation.
[* black] The iPhone 4 utilizes an electronic version of the gyroscope, called a [link|http://en.wikipedia.org/wiki/Microelectromechanical_systems|MEMS] gyroscopelink|http://en.wikipedia.org/wiki/Mems_gyroscope|MEMS gyroscope].
[* black] The iPhone 4 utilizes an electronic version of the gyroscope, called a [link|http://en.wikipedia.org/wiki/Microelectromechanical_systems|MEMS] gyroscopelink|http://en.wikipedia.org/wiki/Mems_gyroscope|MEMS gyroscope].