On the Magnet

Terrella, a spherical magnet.
Verticity, the polar vigor; not perilinsis rotation, but perilineis dynamis a rotating force/power: not a vertex or polos pole, but a turning virtue.
Electrical, those things which attract in the same manner as amber.
Magnetic excitum, that which has acquired powers from a magnet.
Magnetic versorium, iron that has been excited by a magnet upon a needle.
Non-magnetic versorium, made from any metal, serving for electrical experiments.
Armed magnet, which is clothed in an iron helmet or "nose" an iron cap or armature placed on the pole of a magnet.
Meridionaliter, i.e., toward the projection of the meridian.
Paralleletice, i.e., toward the projection of the parallel.
Cusp, the end of a versorium excited by a magnet.
Cross, sometimes called the end not touched or excited, although in instruments generally both ends are excited by the corresponding ends of the stone.
Cortex, i.e., cork bark.
Radius of the magnet's sphere, is a straight line drawn from the top of the magnet's sphere to the surface of the body by the shortest path, which, if continued, would pass through the center of the magnet.
Sphere of virtue, is that whole space through which any virtue of the magnet extends.
Sphere of coition, is that whole space through which a small magnetic body is moved by the magnet.
Ostension, for a demonstration made manifest through a body.
Magnetic coition: because in magnetic bodies motion does not occur through an attractive faculty, but through the concurrence or concord of both, not as occurs with a single heltike dynamis drawing power, but through the syndrome concurrence/meeting of both; it is always a coition of vigor: also of the body, if the mass does not obstruct.
Declinatorium, iron convertible upon an axis, excited by a magnet, in an instrument for declination.

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