The Letter of Petrus Peregrinus on the Magnet, A.D. 1269 — CHAPTER V HOW TO DISCOVER THE POLES OF A LODESTONE AND HOW TO TELL WHICH IS NORTH AND WHICH SOUTH

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The Letter of Petrus Peregrinus on the Magnet, A.D. 1269 CHAPTER V HOW TO DISCOVER THE POLES OF A LODESTONE AND HOW TO TELL WHICH IS NORTH AND WHICH SOUTH · ch 7/19

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