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DELARUE, GERVAIS (1751–1835)

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Originally appearing in Volume V07, Page 945 of the 1911 Encyclopedia Britannica.
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DELARUE, See also:GERVAIS (1751–1835) , See also:French See also:historical investigator, formerly regarded as one of the See also:chief authorities on See also:Norman and Anglo-Norman literature, was a native of See also:Caen. He received his See also:education at the university of that See also:town, and was ultimately raised to the See also:rank of See also:professor. His first historical enterprise was interrupted by the French Revolution, which forced him to take See also:refuge in See also:England, where he took the opportunity of examining a vast See also:mass of See also:original documents in the See also:Tower and elsewhere, and received much encouragement, from See also:Sir See also:Walter See also:Scott among others. From England he passed over to See also:Holland, still in See also:prosecution of his favourite task; and there he remained till in 1798 he returned to See also:France. The See also:rest of his See also:life was spent in his native town, where he was chosen See also:principal of his university. While in England he had been elected a member of the Royal Society of Antiquaries; and in his own See also:country he was made a corresponding member of the See also:Institute, and was enrolled in the See also:Legion of See also:Honour. Besides numerous articles in the See also:Memoirs of the Royal Society of See also:London, the Memoires de l'Institut, the Memoires de la Societe d'See also:Agriculture de Caen, and in other periodical collections, he published separately Essais historiques sur See also:les Bardes, les Jongleurs, et les Trouveres normands et anglo-normands (3 vols., 1834), and Recherches historiques sur la See also:Prairie de Caen (1837); and after his See also:death appeared Memoires historiques sur le palinod de Caen (1841), Recherehes sur la tapisserie de See also:Bayeux (1841), and Nouveaux Essais historiques sur la Dille de Caen (1842). In all his writings he displays a strong partiality for everything Norman, and rates the Norman See also:influence on French and See also:English literature as of the very highest moment. BE LA See also:RUE, See also:WARREN (1815–1889), See also:British astronomer and chemist, son of See also:Thomas De la Rue, the founder of the large See also:firm of stationers of that name in London, was See also:born in See also:Guernsey on the 18th of See also:January 1815. Having completed his education in See also:Paris, he entered his See also:father's business, but devoted his leisure See also:DELATOR 945 See also:hours to chemical and See also:electrical researches, and between 1836 and 1848 published several papers on these subjects. Attracted to See also:astronomy by the influence of See also:James See also:Nasmyth, he constructed in 185o a 13-in. reflecting See also:telescope, mounted first at Canonbury, later at Cranford, See also:Middlesex, and with its aid executed many drawings of the See also:celestial bodies of singular beauty and fidelity. His chief See also:title to fame, however, is his pioneering See also:work in the application of the See also:art of See also:photography to astronomical See also:research.

In 1851 his See also:

attention was See also:drawn to a daguerreotype of the See also:moon by G. P. See also:Bond, shown at the See also:great See also:exhibition of that See also:year. Excited to emulation and employing the more rapid wet-See also:collodion See also:process, he succeeded before See also:long in obtaining exquisitely defined lunar pictures, which remained unsurpassed until the See also:appearance of the See also:Rutherfurd photographs in 1865. In 1854 he turned his attention to See also:solar physics, and for the purpose of obtaining a daily photographic See also:representation of the See also:state of the solar See also:surface he devised the photo-See also:heliograph, described in his See also:report to the British Association, " On Celestial Photography in England " (1859), and in his Bakerian Lecture (Phil. Trans. vol. clii. pp. 333-416). See also:Regular work with this See also:instrument, inaugurated at See also:Kew by De la Rue in 1858, was carried on there for fourteen years; and was continued at the Royal See also:Observatory, See also:Greenwich, from 1873 to 1882. The results obtained in the years 1862–1866 were discussed in two memoirs, entitled " Researches on Solar Physics," published by De la Rue, in See also:conjunction with Professor See also:Balfour See also:Stewart and Mr B. Loewy, in the Phil. Trans. (vol. clix. pp.

1-110, and vol. clx. pp. 389-496). In 186o De la Rue took the photo-heliograph to See also:

Spain for the purpose of photographing the See also:total solar See also:eclipse which occurred on the 18th of See also:July of that year. This expedition formed the subject of the Bakerian Lecture already referred to. The photographs obtained on that occasion proved beyond doubt the solar See also:character of the prominences or red flames, seen around the See also:limb of the moon during a solar eclipse. In 1873 De la Rue gave up active work in astronomy, and presented most of his astronomical See also:instruments to the university observatory, See also:Oxford. Subsequently, in the year 1887, he provided the same observatory with a i3-in. refractor to enable it to take See also:part in the See also:International Photographic Survey of the Heavens. With Dr See also:Hugo See also:Muller as his collaborator he published several papers of a chemical character between the years 1856 and 1862, and investigated, 1868–1883, the See also:discharge of See also:electricity through gases by means of a See also:battery of 14,600 chloride of See also:silver cells. He was twice See also:president of the Chemical Society, and also of the Royal Astronomical Society (1864–1866). In 1862 he received the See also:gold See also:medal of the latter society, and in 1864 a Royal medal from the Royal Society, for his observations on the total eclipse of the See also:sun in 186o, and for his improvements in astronomical photography. He died in London on the 19th of See also:April 1889. See Monthly Notices See also:Roy.

See also:

Asti. See also:Soc. I. 155; Journ. Chem. Soc. lvii. 441; Nature, xl. 26; The Times (April 22, 1889) ; Royal Society, See also:Catalogue of Scientific Papers.

End of Article: DELARUE, GERVAIS (1751–1835)

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