Michel Ferdinand d'Albert, 5th Duke of Chaulnes

Michel Ferdinand d'Albert, 5th Duke of Chaulnes (31 December 1714 – 23 September 1769), Duke of Picquigny and then Duke of Chaulnes from 1744, was a French astronomer, physicist and freemason.[1]

Early life
Compouned microscope of Albert d'Ailly, on display at Conservatoire national des arts et métiers.

Michel Ferdinand d'Albert d'Ailly was the younger son of Marie Anne Romaine de Beaumanoir and Louis Auguste d'Albert d'Ailly, 4th Duke of Chaulnes (1676–1744). His elder brother was Charles François d'Albert d'Ailly, 5th Duke of Chaulnes (1707–1731).[2]

His paternal grandfather was Charles Honoré d'Albert, 3rd Duke of Luynes.[3][4] Among his cousins were Charles Philippe d'Albert de Luynes, the 4th Duke of Luynes as well as the astronomer Paul d'Albert de Luynes, Cardinal and Archbishop of Sens.[4]

Career

He commanded the light cavalry of the Maison du Roi (English: King's Household). In 1750 he became the king's commissioner to the Estates of Brittany and persuaded the assembly to accept the Vingtième tax.

Scientific interests

As an astronomer and physicist he was particularly interested in scientific instruments and used most of his income to build and collect them. His estate contains a remarkable amount of rare and curious items collected from Egypt, Greece, China, including Etruscan vases of all types, antique bronzes and natural history specimens.

At a time when physicists were abandoning glass globe electrostatic generators, which used sulphur or resin, to use glass plates instead, the Duke of Chaulnes built the largest machine of this type that had yet been seen. He used it to produce the effects of lightning for the first time in France.

In 1743, he was made an honorary member of the Académie des sciences. Two years after, he published a memoir in article form which described his experiments, and was included at the beginning of Newton's Opticks Bk. IV. In this work he described his discovery of the peculiarities of the diffraction of light rays reflected by a concave mirror and how they might be stopped by a board pierced in the middle. In 1765, he introduced an astronomical instrument fitted with two achromatic lenses. He also invented a new microscope and had it built in England; his description of the microscope included several plates. He first thought of the manufacture of artificial mineral water.[5]

His final work was a thesis on a new triquetrum which was stronger and easier to use than previous models.[6]

Personal life
His wife, the Duchess of Chaulnes (née Anne Josèphe Bonnier) depicted as the goddess Hebe, by Jean Marc Nattier, 1744

He married Anne Josèphe Bonnier (1718–1787), who replaced the Viscountess of Beaune in 1766 as one of Queen Marie Leszczynska's ladies-in-waiting. Together, they were the parents of:[7]

He died in Paris in 1769. His eulogy was published in the 1769 volume of the anthology of the Académie des sciences.

Publications

References
  1. Chevallier, Pierre (1994). Les ducs sous l'acacia: Ou, Les premiers pas de la Franc-Maçonnerie française, 1725-1743 (in French). Geneva: Slatkine. ISBN 9782051013253.
  2. Chisholm, Hugh, ed. (1911). "Luynes" . Encyclopædia Britannica. Vol. 17 (11th ed.). Cambridge University Press. p. 147.
  3. Bausset, Louis François (1817). Histoire de Fénélon, archevêque de Cambrai: 4 (in French). Lebel. p. 195. Retrieved 11 November 2020.
  4. Luynes, Charles Philippe d'Albert de (1861). Mémoires de Duc de Luynes Sur La Cour de Louis XV (1735-1758): Publiéés Sous Le Patronage de M. Le Duc de Luynes (in French). Firmin Didot Frères, Fils et Cie. Retrieved 10 November 2020.
  5. Chaulnes, Michel-Ferdinand d'Albert d'Ailly (1768). Description d'un microscope, et de différents micromètres destinés à mesurer des parties circulaires ou droites, avec la plus grande précision. Par M. le duc de Chaulnes (in French). L. F. Delatour. Retrieved 11 November 2020.
  6. "Michel-Ferdinand d'Albert d'Ailly, Duc de Chaulnes". catalogue.museogalileo.it. Museo Galileo. Retrieved 11 November 2020.
  7. Morenas, Henri Jougla de (1934). Grand armorial de France: catalogue général des armoiries des familles nobles de France. ... (in French). Les éditions héraldiques. pp. 138–139. Retrieved 11 November 2020.
  8. "Chaulnes (Marie-Paule-Angélique d'Albert de Luynes, duchesse de)". www.chateauversailles-recherche-ressources.fr. Centre de recherche du château de Versailles. Retrieved 11 November 2020.
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