By moving a small compass around the terrella and showing that it always pointed north-south, Gilbert argued that the same thing, on a vastly larger scale, was happening on Earth, and was the only reason why a compass pointed north-south.
(a compass; pointed; ) (Gilbert; argued; that the same thing, on a vastly larger scale, was happening on Earth) Context(Gilbert argued,List([94, 108))):(the same thing; was happening; L:on Earth)
Gilbert argued,List([94, 108))
a compass Gilbert the same thing
pointed argued was happening
that the same thing, on a vastly larger scale, was happening on Earth
L:on Earth