دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a wheel or disk mounted to spin rapidly about one axis but free to rotate about one or both of two axes perpendicular to each other. The inertia of the spinning wheel tends to keep its axis pointed in one direction regardless of how the other axes are rotated.

n: a wheel or disc mounted to spin rapidly about one axis,but free to rotate about one or both of other two axes.the inertia of the wheel keeps the axis aligned with the reference direction (true north).