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Deslandres' undergraduate years at the École Polytechnique were played out against the aftermath of the Franco-Prussian War and the chaos of the Paris Commune so, on graduation in 1874, he responded to the continuing military tension with the emerging Germany by embarking on a military career. Rising to the rank of captain in the engineers, he became increasingly interested in physics and, in 1881Events January 16- 24 ? Siege of Geok Tepe ? Russian troops under general Skobeleff defeat Turkomans January 25 Thomas Edison and Alexander Graham Bell form the Oriental Telephone Company February 5 Phoenix, Arizona is incorporated. February 13 First issu, resigned his commission to join Alfred Cornu's laboratory at the École Polytechnique, working on spectroscopySpectroscopy is the study of spectra, ie. the dependence of a physical measure to frequency. Spectroscopy is often used in physical and analytical chemistry for the identification of substances, through the spectrum emitted or absorbed. A device for recor. He continued his spectroscopic work at the SorbonneLa Sorbonne was the name of the former University of Paris in Paris, France, one among the most ancient in Europe. History It was founded in 1257 by Robert de Sorbon, after whom it is named. It is also the name of its main campus in the 5th arrondissement, earning his doctorate in 18881888 is a leap year starting on Sunday (click on link for calendar). In Germany, 1888 is known as the 1888 Year of Three Emperors. Events January 3 91cm telescope first used at Lick Observatory January 12 ? Blizzards in Dakota and Montana, Minnesota, Nebr and finding numerical patterns in spectral lineA spectral line is a dark or bright line in an otherwise uniform and continuous spectrum, resulting from an excess or deficiency of photons in a narrow frequency range, compared with the nearby frequencies. Spectral lines are the result of interaction bets that paralleled the work of Johann Balmer and were to catalyse the development of quantum mechanicswavefunctions of an electron in a hydrogen atom possessing definite energy (increasing downward: n 1,2,3,. and angular momentum (increasing across: s p d . Brighter areas correspond to higher probability density for a position measurement. The angular mom in the 20th century.
In 1868, Pierre Janssen's solar observations had led him to report to the Académie des Sciences that It is no longer geometry and mechanics which dominate [in astronomy] but physics and chemistry. Such advice was sternly rejected by director of the Paris Observatory Urbain Le Verrier and the French government awarded Janssen a grant to establish an astrophysical observatory at Meudon on the outskirts of Paris with Janssen as the sole astronomer. In 1889, Le Verrier was succeeded by Amédée Mouchez who set to work to bring astrophysics into the mainstream by hiring Deslandres. Deslandres developed the spectroheliograph simultaneously with George Hale.
In 1898, he joined Janssen at Meudon, increasing the scientific staff by 100%. On Janssen's death in 1907, Deslandres became director and embarked on a programme of expansion. At the outbreak of World War I in 1914, though already in his 60s, he returned to active service in the engineers as a major and later lieutenant colonel. In 1918, following the armistice, he resumed his office at Meudon until 1926 when its administration merged with that of the Paris Observatory, Mouchez assuming the role of director of both institutions until his retirement in 1929.
He remained active in research right up until his death. Fellow astronomer Raymond Michard observed that In his bearing, his character and his style of life Deslandres always remained more akin to the soldier (and the officer) than to the scholar.
A crater on the Moon is named after him.