Based on the declinations that were known at the time, he proposed that the continents, because of their raised topography, formed centers of attraction that made compass needles deviate.
42.
Comes from Biot and Savart's early work on the stuff where they were looking at how the direction of a compass needle changed with distance to a conducting wire.
43.
Observations of the rhythmic movement of compass needles due to the influence of an aurora were confirmed in the Swedish city of Uppsala by Anders Celsius and Olof Hiorter.
44.
Mariners had noticed that lightning strikes had the ability to disturb a compass needle, but the link between lightning and electricity was not confirmed until Benjamin Franklin's proposed experiments in 1752.
45.
The side of a boundary marker that faced the federal territory was inscribed " Jurisdiction of the United States " and with the distance in miles and compass needle at that place.
46.
The rotation _ and its effect on the outer core, a surrounding moat of liquid iron _ generates Earth's magnetic field, the invisible force that nudges compass needles toward the North Pole.
47.
But Earth's magnetic field flips every so often, sometimes pointing toward the North Pole and sometimes toward the South Pole, and the compass needles in the different rock layers record those flips.
48.
The good news is that any disappearance of the dipole will be temporary, the halfway point along a southward swing that would leave compass needles pointing toward Antarctica rather than the frozen North.
49.
These theories of electricity and magnetism were thought of as two separate phenomena, until Hans Christian �rsted noticed that a compass needle would deflect from magnetic north when placed near an electric current.
50.
The student suggested to his amazed professor that this was evidence of a shift in the magnetic field in such a way that a compass needle would have pointed south 30, 000 years ago.
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