Giacomo BELGRADO. — Jesuit and scientist, born in Udine on 16 Nov. 1704; entered the novitiate on 16 Oct. 1724; first taught literature in Venice, then, after ordination to the priesthood, science in Parma, where he had an astronomical observatory installed in one of the college’s towers. From 1750 to 1763 he served at court. The suppression of the Society of Jesus in 1773 found him rector of the S. Lucia college in Bologna. He died in his native city on 26 Mar. 1789.
A member of numerous academies, he published several dissertations in Latin on physics and physiology, eclipse observations, etc. (see the list in Sommervogel or in the *Biblioteca matematica italiana* by Riccardi). More important are *Theoria cochleae Archimedis* (Parma 1767) and, above all, the two-part treatise: *De analyse volgariis usu in re physica* and *De analyse sinfinitorum usu in re physica* (2 vols., 1716–62), which earned him election as a corresponding member of the Paris Academy of Sciences. He oversaw the publication of a series: *Nuova raccolta di autori che trattano del moto dell'acqua* (7 vols., Parma 1766–68; reprinted Bologna 1823–45). In his later years he addressed apologetic and religious topics, such as *Dell'esistenza di Dio da' teoremi geometrici demostrata* (Udine 1777) and *Ragionamenti sacri sulle tre prigioni di S. Giov. Battista, S. Pietro e S. Paolo* (ibid. 1824).