by William Gilbert, On the Magnet — Book IV. Chap. 10… (1900)
“ The earth turns magnetick bodies and at the æquator directs them strongly toward the pole: [227] at the poles there is no direction, but only a strong coition through the congruent poles. Direction is therefore weaker near the poles, because by reason of its own natural tendency to turn, the versorium dips very much, and is not strongly directed. But since the force of those elevated lands is more vigorous, for the virtue flows from the whole globe, and since also the causes of variation are nearer, therefore the versorium deflects the more from its true direction toward those eminences. ”
