Special offer Gerbera Daisies Seeds 20 Wintergreen / Teaberry Seeds - Gaultheria Procumbens Evergreen, USA Grown Tea Plant ...
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Why ships have two metal balls on the compass, the clever trick that fixes magnetic errors at sea
A ship’s steel hull becomes part of Earth’s magnetic field, which can quietly skew a magnetic compass in different directions as the vessel turns and heels. This explains how binnacle correctors work, ...
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