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Personal details
name: Francesco Denza
born: 7 June 1834 – Naples
died: 14 December 1894 – Rome
Nationality: Italian
Occupation: priest, meteorologist and astronomer
Affiliation: Barnabites
Biography
Francesco Denza was born in Naples on 7 June 1834 and joined the Barnabites at a young age. He studied philosophy in Macerata and, from 1853, theology in Rome at the San Carlo College, where he met Angelo Secchi: from him he inherited aninterest in astronomy and meteorology, which he pursued throughout his life alongside his priestly ministry. After graduating in mathematics and physics from the University of Turin in 1857, he taught at the Carlo Alberto College in Moncalieri, where he was ordained a priest in 1858 and where he remained until 1890.
In 1859, he founded a meteorological observatory in Moncalieri and began contacting other observatories in Piedmont and the Aosta Valley, with the aim of collecting and comparing data recorded in different locations. This led to the establishment of the ‘Corrispondenza alpina’, which brought together the observatories of Moncalieri, Alessandria, Turin, Pinerolo, Aosta, Bra and Mondovì. In the early 1870s, the project became affiliated with the Italian Alpine Club: mountain stations were established across the Italian Alps, and the ‘Corrispondenza’ took on the name ‘Italian Meteorological Correspondence of the Alps and the Apennines’. The network grew from sixteen stations in 1871 to twenty-eight in 1873, the year in which the observatory at the IV Cantoniera dello Stelvio was inaugurated, coinciding with the CAI congress in Bormio. From 1875, Denza extended the network to cover the whole of Italy and, with the help of Italian missionaries, to South America as well. When the government of the Kingdom of Italy offered him the post of Director-General of Italian Meteorology in 1866, he declined so as not to leave the college in Moncalieri.
He combined organisational work with field measurements. In 1870, he climbed Mount Monviso and, at the summit, recorded the pressure and temperature to calculate its altitude; in the same year, he travelled to Sicily to observe the total solar eclipse of 22 December. In 1875, he travelled to Tunisia to study magnetic constants and was the first to determine those for Italy, visiting 77 stations. He also developed instruments, including the anemopluviograph that bears his name, which was created by combining an anemograph and a pluviograph.
Sources date the founding of the Italian Meteorological Society to 1881 or 1882; Denza served as its director and is regarded as its founder. In this capacity, he also promoted the first systematic seismological surveys and initiated the publication of theItalian Meteorological Yearbook. Despite suffering a stroke that paralysed the right side of his body, he continued to work and organised a scientific exhibition by the clergy to mark the Vatican Exhibition in honour of Leo XIII, during which he persuaded the Pope to re-establish the Vatican Observatory. He was appointed its director. In 1889, at the astronomical congress in Paris, he secured the new institution’s inclusion amongst the eighteen observatories tasked with producing a photographic map of the sky. For the Specola, built on the Leonine Tower, a 33-cm aperture Gautier astrographic equatorial telescope and a heliograph were purchased, and Denza also equipped it for meteorological, magnetic and seismic observations. He left Moncalieri in 1890 to move to Rome.
In 1892, he was elected president of the Pontifical Academy of the New Lincei and received over a hundred honours, including the title of Commendatore of theOrder of Saints Maurice and Lazarus, conferred upon him by Umberto I, who had been his student at Moncalieri. He died in Rome on 14 December 1894, following another cerebral haemorrhage.
Places and commemorations
Stavèl Francesco Denza mountain refuge (2,298 m) - Vermiglio, Presanella range – built by the Tridentine Mountaineers’ Society in 1898 and inaugurated on 21 August 1899, it is named after Denza in recognition of his close association with the society when the network of weather stations was established
Works
Cosmic Meteors, Milan, 1869
Meteorology Applied to Agriculture, Florence, 1872
An Ascent of Monviso, Turin, 1874
Meteorology and the Mountains, Turin, 1876
Instructions for Meteorological Observations and Barometric Altimetry, 2 vols., Turin, 1883
Bibliography
As a writer
Angelo Secchi, Francesco Denza, Correspondence (1858–1877), edited by Sabino Maffeo, Ileana Chinnici and Manuela Coniglio, Florence, Leo S. Olschki, 2024
As a key reference
B. O. Zanotti, Father Francesco Denza, Bulletin of the Italian Alpine Club, no. 61, 1894
Giuseppe Monaco, Denza, Francesco, Biographical Dictionary of Italians, vol. 38, Istituto della Enciclopedia Italiana, 1990
D. Frigerio et al., Father Francesco Denza: from the Moncalieri Observatory to the Italian Meteorological Society, Nimbus, no. 5, 1994