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A lack of parallelism between axis of rotating member and stationary member.

Related Terms

GYRO ERROR

The error in the reading of the gyrocompass, expressed in degrees east or west to indicate the direction in which the axis of the compass is offset from true north.

GYROSCOPE

A rapidly rotating mass free to move about one or both axes perpendicular to the axis of rotation and to each other. It is characterized by GYROSCOPIC INERTIA and PRECESSION. Usually shortened to GYRO. The term also refers colloquially to the GYROCOMPASS.

GYROSCOPIC DRIFT

The horizontal rotation of the spin axis of a gyroscope about the vertical axis

HORIZONTAL EARTH RATE

The rate at which the spin axis of a gyroscope must be tilted about the horizontal axi

AXIAL-LOAD BEARING

A bearing in which the load acts in the direction of the axis of rotation.

INPUT AXIS

The axis of applied torque of a gyroscope

LONGITUDINAL SEAM

A riveted or welded seam along the longitudinal axis of a boiler shell or drum.

INTEGRATING ACCELEROMETER

An instrument which senses the component of specific acceleration along an axis known as the sensitive axis of the accelerometer, and produces an output equal to the time integral of that quantity. Also called VELOCITY METER.

APOCENTER

In an elliptical orbit, the point in the orbit which is the farthest distance from the focus, where the attracting mass is located. The apocenter is at one end of the major axis of the orbital ellipse. The opposite is PERICENTER, PERIFOCUS, PERIAPSIS. Also called APOAPSIS, APOFOCUS

ANGLE OF ROLL

The angle between the transverse axis of a craft and the horizontal. Also called ROLL ANGLE
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