C. W. Eckersberg: Professor G. F. Ursin (1797-1849). 1836. Unsigned.

Portrait of Professor G. F. Ursin (1797-1849). 1836. Unsigned. Oil on canvas. 39 x 30 cm. Contemporary frame. Philip Weilbach's catalogue of C. W. Eckersberg's paintings, 1872, p. 245 under “VII. Portraits executed from 1816–1844”, mentioned p. 134. Emil Hannover, “Maleren C. W. Eckersberg, En studie i dansk kunsthistorie”, catalogue of C. W. Eckersberg's paintings, 1898, no. 515, mentioned pp. 207-208 and ill. p. 207. Exhibited: Charlottenborg 1837, no. 273 (Supplement). Kunstforeningen, “Udstillingen af C. W. Eckersbergs Malerier”, 1895, no. 290. Statens Museum for Kunst, “Eckersberg – En smuk løgn”, 2015-2016, cat. no. 79, mentioned p. 216, ill. pp. 95 and 216. Hamburger Kunsthalle, “Christoffer Vilhelm Eckersberg – Faszination Wirklichkeit. Das Goldene Zeitalter der dänischen Malerei”, 2016, cat. no. 14, mentioned p. 271 and ill. pp. 138 and 271. Fondation Custodia, “C. W. Eckersberg”, Paris 2016, cat. no. 67, mentioned p. 248 and ill. p. 249. Literature: Peter Michael Hornung and Kasper Monrad: “C. W. Eckersberg – dansk malerkunst fader”, 2005, mentioned and ill. p. 373. “C. W. Eckersbergs dagbøger 1810-1837”, edited and annotated by Villads Villadsen, 2009, vol. 1, pp. 704, 705 and 712. Gry Hedin: “Billedkonstruktion. Kunsten at se med ét øje” in “Eckersberg”, 2015, exhibition catalogue, mentioned p. 164 and p. 172 note 40. Roberta J. M. Olson and Jay M. Pasachoff, “Shedding Light on Danish Art and Astronomy during the ’Golden Age’” in Artibus et Historiae, no. 85 (XLIII), 2022, pp. 277-303, mentioned pp. 278-281 and ill. p. 279. Roberta J. M. Olson: “Georg Frederick Ursin,” in Biographical Encyclopedia of Astronomers, ed. by P. D. Nicholson and J. L. Bartlett, New York: Springer, 2026, ill. and mentioned. Provenance: Professor G. F. Ursin (1797-1849). By descent to his wife Helene Elisabeth Ursin (née de Thurah) (1797-1876) (1872). Their son, ship's machinist in the Navy Lars Herman Ursin (1824-1907) (1898). Thereafter by descent within the family. G. F. Ursin was the great-grandfather of the present owner. Georg Frederik Ursin (1797-1849) was a mathematician and astronomer and, from 1827, professor of mathematics at the Royal Danish Academy of Fine Arts. He was also an observer at the Copenhagen Observatory and a significant communicator of his era's mathematical and astronomical knowledge. It was precisely his scientific insight that tied him closely to C. W. Eckersberg, and their collaboration was of decisive importance for Eckersberg's work on the theory of perspective. In the spring of 1833, Eckersberg asked Ursin to read through the manuscript of his first treatise on perspective, “Forsög til en Veiledning i Anvendelsen af Perspektivlæren for unge Malere.” In his diary, he noted on 18 April 1833: “This evening Ursin came to go through the little piece on perspective with me”. The collaboration continued and was later expanded around “Linearperspectiven, anvendt på Malerkunsten” from 1841. Ursin's mathematical expertise helped Eckersberg systematise the theory of perspective, which came to occupy a central place in his teaching and artistic thinking.

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