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Italian Jesuit and natural philosopher, born at Udine, 16 November, 1704; died in the same city, 26 March, 1789. He belonged to a noble family and received his education at Padua. He entered the novitiate of the Society of Jesus 16 October, 1723, and showed marked talent, studying mathematics and philosophy at Bologna, under Father Luigi Marchenti, a former pupil of Varignon at Paris. After completing his philosophical studies he taught letters for several years at Venice, where he won the affection of his students as well as the esteem and friendship of the scholars of that city. He studied theology at Parma and then became professor of mathematics and physics at the university, holding this position for twelve years. While at Parma he did much experimental work in physics with apparatus specially constructed by two of his assistants. After pronouncing his solemn vows on 2 February, 1742, Belgrado was summoned to the court, where he was appointed confessor, first to the Duchess, and later to the Duke Don Philippo, The title of mathematician of the court was also bestowed on him. He 1757 he erected an observatory on one of the towers of the college of Parma and furnished it with the necessary instruments. In 1773, he became rector of the college at Bologna. He was a member of most of the academies of Italy and a corresponding member of the Academie des Sciences of Paris. He was likewise one of the founders of the Arcadian colony of Parma. He wrote on a variety of subjects, among his works being "I Fenomeni Elettrici" (1749); "Della riflessione de' corpi dall' acqua e della diminuzione della mole de' sassi ne torrebti e ne' fiumi" (1755); "De analyseos vulgaris usu in re physica" (1761-62); "Delle sensazioni del freddo e del calore" (1764); "Theoria Cochleae Archimedis" (1967); "Dell' esistenza di Dio da' teoremi geometrici" (1777), etc.
Mazzuchelli, Gli Scrittori d'Italia (Brescia, 1760), II, ii; Sommervogel, Bibliotheque de la c. de J. (new ed., Paris, 1890).