Interpretation of certain words.[[1]]
Terrella, a globular loadstone.
Verticity, polar vigour, not περιδίνησις but περιδίνεισιος δύναμις: not a vertex or πόλος but a turning tendency.
Electricks, things which attract in the same manner as amber.
Excited Magnetick, that which has acquired powers from the loadstone.
Magnetick Versorium, a piece of iron upon a pin, excited by a loadstone.
Non-magnetick Versorium, a versorium of any metal, serving for electrical experiments.
Capped loadstone, which is furnished with an iron cap, or snout.
Meridionally, that is, along the projection of the meridian.