Magnetic Axis to Marks and Deeps

The direction of the polarization of the magnetic needle.

The bearing of an object by compass.

The inclination towards the earth of one of the poles (points) of a magnetic needle.

A line drawn through those points on the earth's surface where the magnetic dipping needle preserves a horizontal position. The magnetic equator is not the same as the earth's equator, but an irregular line running round the globe, not greatly distant from the earth's equator, which it crosses in two places, one near the west coast of Africa, and the other about the middle of the Pacific Ocean.

The power possessed by a magnet of communicating its properties to a bar of steel in its near vicinity, though perhaps not touching it; what is known as earth's induction is the communication of magnetism from the earth to iron and steel bodies, such as the hulls of vessels, etc.

The direction assumed by a magnetic needle when suspended so as to turn freely, and removed from disturbing magnetic influences.

A magnetic bar of steel balanced on a pivot so as to turn freely and settle in the magnetic meridian.

Two places on the earth's surface, approximate to the north and south poles, where a dipping needle assumes a position perpendicular to the horizon. The north magnetic pole is situated in the latitude of about 70 deg. north and the longitude of 97 deg. west; the south magnetic pole in the latitude of about 70 deg. south and the longitude of 145 deg. east.

The power of magnetic attraction; the power of a magnet to attract iron.

A tube fitted with convex glasses or lens by which the apparent magnitude of an object seen through it is increased.

Comparative brightness; the stars are of the first, second, third, fourth, fifth, sixth and seventh magnitudes; stars smaller than the seventh magnitude cannot be seen with the naked eye, and are called telescopic stars.

To sight the land from a distance when coming from seawards.

A whirlpool off the Norwegian coast caused by the tides.

A magnetic instrument used on board vessels which indicates the cardinals and the intermediate points; a pathfinder for the mariner across the trackless waste.

Relating to the sea.

The latitude and longitude of certain places on the sea-coast.

(See Part I.)