A determined Verticity and a disponent Faculty are what
arrange magneticks, not a force, attracting or pulling them
_together, nor merely strongish coition or unition_.
[Illustration] {132}
In the neighbourhood of the æquinoctial A there is no coition of the ends
of a piece of iron with the terrella; at the poles there is the strongest.
The greater the distance from the æquinoctial, the stronger is the coition
with the stone itself, and with any part of it, not with its pole alone.
Yet pieces of iron are not raised up on account of some peculiar attracting
force or a stronger combined force, but on account of that common directing
or conforming and rotating force; nor indeed is a spike in the part about
B, even one that is very small and of no * weight[206], raised up to the
perpendicular by the strongest terrella, but cleaves to it obliquely. Also
just as a terrella attracts magnetick bodies variously with dissimilar
forces, so also an iron snout placed on the stone obtains a different
potency in proportion to the latitude, * just as a snout at L by its firmer
connection resists a greater weight more stoutly than one at M, and at M
than at N. But neither does the snout raise the spike to the perpendicular
except at the poles, as is shown in the figure. A snout at L may hold and
lift from the earth two ounces of iron in one piece; yet it is not strong
enough to raise an iron wire of two grains weight to the perpendicular,
which would happen if the verticity arose on account of a * stronger
attraction, or rather coition or unition.
* * * * *