To explain the manner of its progress,
let A B represent a line drawn across the dominions of Balnibarbi,
let the line c d represent the loadstone, of which let d be the
repelling end, and c the attracting end, the island being over C:
let the stone be placed in position c d, with its repelling end
downwards; then the island will be driven upwards obliquely towards
D. When it is arrived at D, let the stone be turned upon its axle,
till its attracting end points towards E, and then the island will
be carried obliquely towards E; where, if the stone be again turned
upon its axle till it stands in the position E F, with its
repelling point downwards, the island will rise obliquely towards
F, where, by directing the attracting end towards G, the island may
be carried to G, and from G to H, by turning the stone, so as to
make its repelling extremity to point directly downward. And thus,
by changing the situation of the stone, as often as there is
occasion, the island is made to rise and fall by turns in an
oblique direction, and by those alternate risings and fallings (the
obliquity being not considerable) is conveyed from one part of the
dominions to the other.
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