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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.
Kaleidoscopes Explained. At the most basic level, a kaleidoscope is made of two or more mirrors or reflective surfaces positioned at an angle to each other, usually forming a V-shape or a triangle. A tubeorcase -- often looking like a spyglass -- is the body surrounding the mirror assembly.