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A periodic current thus flowed in one direction relatively to the coil in one half-turn from a position perpendicular to the magnetic meridian, and in the opposite direction in the next half-turn.

The first symptom of an aurora borealis is commonly a low arch of pale, greenish-yellow light, placed at right angles to the magnetic meridian.

When used, the dip needle must be set so that the plane in which the needle swings contains the magnetic meridian, as indicated by the horizontal needle.

Neither dazed nor dazzled, his brain had swung true to the magnetic meridian of his faith.

A bent wire, carrying a small magnetic needle, is balanced on the steel point, so that the magnet, with the fine wire, arranges itself horizontally in the direction of the magnetic meridian.