Mary Countess of Rosse

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Mary Field

Birthplace: of York, Yorkshire, England
Death: Died in Hyde Park, London, England
Immediate Family:

Daughter of John Wilmer Field and Ann Wharton Myddleton
Wife of William Parsons, 3rd Earl of Rosse
Mother of Lawrence Parsons, 4th Earl of Rosse; Hon. Richard Clere Parsons and Sir Charles Algernon Parsons OM KCB FRS

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About Mary Countess of Rosse

Mary Rosse, Countess of Rosse (née Mary Field) (1813-1885), was a British amateur astronomer and pioneering photographer. She was one of the early practitioners of making photographs from waxed-paper negatives.


Mary Field was born in Britain in 1813, in Yorkshire, the daughter of John Wilmer Field, a wealthy estate owner.

Through her family she met William Parsons, 3rd Earl of Rosse, and they were married on 14 April 1836.

In the early 1840s the couple became interested in astronomy, and Mary helped her husband build a giant telescope, that was considered a technical marvel in its time. She was an accomplished blacksmith - which was very unusual for higher class women of this time - and much of the iron work that supported the telescope was constructed by her.

During the Great Famine of 1845-47 in Ireland she was responsible for keeping over five hundred men employed in work in and around Birr Castle, where she and her husband lived.

The countess of Rosse gave birth to eleven children, but only four survived until adulthood:

Lawrence Parsons, 4th Earl of Rosse (17 November 1840 – 30 August 1908)

Reverend Randal Parsons (26 April 1848 – 15 November 1936)

Hon. Richard Clere Parsons (21 February 1851 – 26 January 1923), apparently made a name for himself building railways in South America.

Sir Charles Algernon Parsons (13 June 1854 – 11 February 1931), known for his commercial development of the steam turbine.

Mary Parsons, countess of Rosse, died in 1885.


In 1842 William Parsons began experimenting in daguerreotype photography, possibly learning some of the art from his acquaintance William Henry Fox Talbot. In 1854 Lord Rosse wrote to Fox Talbot saying that Lady Rosse too had just commenced photography, and sent some examples of her work. Fox Talbot replied that some of her photographs of the telescope "are all that can be desired". Lady Rosse became a member of the Dublin Photographic Society, and in 1859 she received a silver medal for "best paper negative" from the Photographic Society of Ireland. Many examples of her photography are in the Birr Castle Archives. Much of the topography of Birr Castle that she portrayed has changed very little, and it is possible to compare many of her photographs with the actual places.

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Mary Countess of Rosse's Timeline

July 21, 1813
of York, Yorkshire, England
July 24, 1813
Bradford, Yorkshire, England
July 24, 1813
Bradford, Yorkshire, England
April 14, 1836
Age 22
St. George Hanover Square, Middlesex, England
November 17, 1840
Age 27
February 21, 1851
Age 37
June 13, 1854
Age 40
July 22, 1885
Age 72
Hyde Park, London, England