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Instrument with magnets that floats on a liquid; it indicates magnetic north.
Axle around which the compass card rotates.
Retractable cover that protects the glass dome from scratches when not in use.
Watertight case containing the magnetic elements, which float in a liquid (oil or alcohol) to reduce oscillations.
Rotating disk graduated from 0° to 360° and integrated with two magnets; it shows the cardinal points and the points in between.
Transparent nondistorting hemispherical cover for the bowl containing the liquid.