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(jÄ«â²rÉ-skÅpâ²) An instrument consisting of a disk or wheel that spins rapidly about an axis like a top. The spinning motion keeps the axis fixed even if the base is turned in any direction, making the gyroscope an accurate navigational instrument and an effective stabilizing device in ships and airplanes.
So here is the first published (that I know of) account of the physics behind how a gyroscope works. Here is a pictorial of a simplified version of a gyro. A quick explanation of how a gimbaled gyro functions. Figure 4 shows a simplified gyro that is gimbaled in a plane perpendicular to the tilting force.