Peregrinus, Petrus (Peter the Pilgrim) pē´trəs pĕrəgrĭn´əs [key], c.1220–?, medieval scholar and soldier. The tutor of Roger Bacon , he wrote the first important study of magnetism, Epistola de Magnete, in which he described simple magnetic attraction and repulsion. He improved the compass by placing the lodestone on a pivot and surrounding it with a graduated directional scale. His ideas were further elaborated in the 16th cent. by William Gilbert .
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