How does a magnetic compass work? Well, it’s all down to basic physics and human ingenuity. The key component of a standard baseplate compass is its magnetized needle, which is allowed to spin freely ...
Running title: Comparison of auroral displays with the extent of spots on the sun. "From the American journal of science and arts, v. V, April, 1873"--p. [1]. siris_sil_386842 ...
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